Global Warming and Solutions
Introduction to global warming:
greenhouse warming has been considerable time, possibly since the earth was formed first. Greenhouse gas emissions or conducive to the greenhouse effect, act as a blanket or glass panels on the walls of a greenhouse, but reflect the heat the earth radiates back into space to land, keeping it in. You see, the heat balance is maintained on earth by different processes. Solar radiation was about to land, and clouds and atmosphere reflect some of them back into space. More radiation is absorbed by the atmosphere, clouds and land surface. Then the earth radiates heat back in the form of infrared radiation. To maintain a constant temperature, the rate that the Earth emits energy in the space must be equal to the rate that absorbs energy from the sun. The greenhouse effect is a refusal to allow a certain amount of terrestrial radiation to pass this maintains the temperature of the Earth's average surface about 60 ° F (15 ° C). If there were no greenhouse gases in the atmosphere, much of the heat radiated by Earth's surface would be lost directly to space, and the planet's temperature would be 0 ° F (-18 ° C), too cold for most lifestyle (greenhouse).
There are several atmospheric gases that act as greenhouse gases (GHG) emissions. The most famous is the carbon dioxide emitted through the respiration of humans and animals, burning of fossil fuels, deforestation and other changes in land-use. Dioxide Carbon is the main focus of many greenhouse gases sanctions because it is the main greenhouse gas that has been released into the atmosphere. However, some other gases may have a greater effect on climate than CO2. If one examines the research on possible warming effect of other greenhouse gases in relation to CO2, one finds in a period of 100 years, there are gases present in much smaller amounts that have a much more concentrated. Methane gas produced by livestock (flatulence) oil and gas production, coal mining, solid waste, and moisture in rice farming, has 11 times more warming potential CO2 per unit volume (Science), or 25 times more per molecule (Clarkson). Nitrous oxide, produced mainly in relation to current agricultural practices, has 270 times the warming potential per unit volume during this period that the CO2 (Science). Chlorofluorocarbons (CFCs) used as refrigerants gases and aerosol that were banned some time ago because of its potential to exhaust the ozone layer, has 3400-7100 times more warming potential than CO2 per unit Volume (Science). Hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs), substitutes for CFCs, have a slightly lower global warming potential in 1200 to 1600 times greater than the CO2 per unit volume (Science).
And so, as one might infer, studies show that adding greenhouse gases may cause that the earth is warmer than naturally. Here is what is known as anthropogenic (human-caused) global warming. Often, the global terms global warming and climate change are used interchangeably. (We will do the same, for the sake of continuity.) But this is not correct and concepts are different. Change climate including rainfall, wind patterns and temperature. It also refers to the whole climate, not just the weather of a place. Warming is indicative of global climate change. It is an example of climate change increase the average temperature environment. The Earth has experienced warming and much too cold throughout its history. There is much debate over whether or not the earth is undergoing climate change and global warming, if it is, if the underlying causes are artificial or natural. Different studies gave different results.
However, although one could say that greenhouse gases were at a stable level before the start of the Industrial Revolution, the Earth's climate tends to fluctuate widely. A period of 5000-3000 BC (where civilization began) is called and other climatic optimum period from 900 – 1200 AD is called the small MWP climatic optimum, or both so-called for its unusually warm temperatures. Similarly, a period from 1550 to 1850 known as the Little Ice Age for its unusually cold (Pidwirny). At this time, glaciers in southern Norway reached its greatest extent in 9000 years (Keigwin). With large variations possible, it is difficult to know where following natural fluctuation might lead. Perhaps those who find that global climate is warming is simply the measurement of a natural fluctuation. Or perhaps a natural fluctuation, is to mask the true effect of greenhouse gases on the globe.
Global Warming: Big Questions, Big Research
As mentioned above, there is great debate over whether or not humans are causing global warming. Some activists and researchers have resorted to insults and accusing the other side of having "sold out interest" to either special. As mentioned earlier, we tried to cut the personal attacks between warring parties, find the kernel of truth (or logic, where truth can not be discerned), and get to the bottom of the matter.
In order to properly read any reports or investigations of global climate change, it should be borne in mind that nothing (or nothing) is right. Everything has a certain degree of uncertainty, a true taste of the unknown. There really is no conclusive evidence of global warming, and many scientists in favor of the hypothesis global warming say it will be a decade or more before it is possible to develop any substantial evidence. As an anonymous senior climate modeler said warming Overall, "The more I learn, the more you understand that you do not understand a lot" (Kerr – Forecast greenhouse.) The global climate is by nature always fluctuating, and that only adds to confusion about anthropogenic global warming. If there were an anthropogenic global warming, which could not be sure As the temperature is supposed to be less, as the climate changes are a natural part of life on Earth. Compounding the confusion is that natural variability, which Constantly working to confuse the same way that researchers approach the assignment of a perceived change in average temperature to some external factor, such as composition of the atmosphere (GHG) or solar variation. One of the reasons for this variability is the long-time adjustment of heat storage in the oceans and current systems. It is estimated to be several hundred years for water to flow through the deepest of the oceans to the surface. That means that if, for example, a pool of Additional cold water stresses and stored in the back by some mechanism monster, could stay there for a century or two before resurfacing and produce a local change, cool weather (Clarkson, North and Schmandt).
Since no one can create another Earth (much less one that behaves exactly like ours) and perform experiments alter the atmosphere above it, we have the alternative theory based on observations. In other words, the only way you can pretend to know anything that could be changing our climate is toying with data such as temperature records, measurements of the well, etc, and see what scenarios the data will agree.
Most of the body of the global warming theory is based on computer climate models called general circulation models or GCMs, since they are almost the only tools that researchers have global warming. MCG is difficult to do properly as going through a deep understanding of form in the atmosphere and how their actions are interconnected with other planetary bodies, such as the oceans or the terrestrial biosphere. However, our understanding the inner workings of the atmosphere and the ways it relates to other planetary bodies is not very good. The renowned NASA climate modeler James Hansen, the man whose congressional testimony the summer of 1988 began the debate on climate change, states in the Proceedings of the National Academy of Sciences: "The forcing [out] The drivers of long-term climate change are not known with sufficient precision to define future climate change. "One of the key illustrations chaos, the butterfly effect, the system shows the interconnection of the atmosphere when it states that a butterfly fluttering through the air in China could cause rain in New York the following spring.
MCG are made by formulating the mathematical descriptions of relationships between the atmosphere and oceans / biosphere / Cryosphere system and performing numerical experiments. Certainly, they are unable to form a mathematical description based on the type of interconnections, or feedback, that the butterfly effect might suggest. In fact, Michael Schlesinger, modeler to the University of Illinois, Urbana-Champaign, says that "in the climate system, there are 14 orders of magnitude, from the global scale – that is 40 million meters – up to the scale of a small aerosol particles on which water vapor may change to a phase of] [liquid cloud particles - which is a fraction of a millionth of a millimeter. "Of these 14 orders of magnitude, only the two largest (Planetary scale and the scale of weather disturbances) currently can be included in the models. Schlesinger notes that, in order to include the third order of magnitude (the magnitude of thunderstorms within 50 km resolution) a computer a thousand times faster than would be necessary, "a machine that maybe teraflops we'll have in 5 years. "Including all require orders of magnitude from 1036 to 1037 times more computing power (Kerr - Forecast greenhouse).
Because the MCG is so difficult to do, often represent the same processes in different ways, two models can have two different mathematical descriptions what effect clouds have on global warming, for example. Processes with a lower resolution to a few hundred miles can not be directly represented in the models, but must be parameterized, or expressed in terms of movements on a larger scale, since the models do not have the resolution necessary to adequately represent actions major weather systems such as tropical and extratropical cyclones. To compensate for this fall, few settings (such as horizontal eddy viscosity, cumulus convection in large-scale precipitation, gravity wave drag, etc) are calibrated. In addition to these settings are usually adaptations flow as corrections, and are an important "fudge factor" of the MCG. These factors keep the models of floating in nothingness. As Kerr (Model), said: "modelers climate have been "cheating" for so long it's almost become respectable. "Through these settings, MCG attempt to represent climate certain features reasonably well, but it is possible that they could be getting the correct numbers, but have the wrong underlying reason for them. As a result, capacity of these models to simulate the climate change may well be affected.
Recently, a model has been designed and tested at the National Center Atmospheric Research to eliminate the flow of corrections. This model of the effects of ocean eddies, not by the decrease of the scale, but parameterization, from the effects of these invisible eddies on the scales with a larger model, more realistic way of mixing hear through the ocean than any previous model did. This model does not fall into chaos even after 300 years of the race. This model gives a 2 º C rise in temperature due to duplication CO2. (Some of the general circulation models most people assumes that the concentration of CO2 will double or quadruple in 70 years in 140 years and the use of course of trying to predict what the weather is like in decades or even centuries based on double or quadruple.) This figure is in the bottom of estimates and sensitivity makes model to greenhouse gases, near the lower end of the current model estimates (Kerr - Model).
MCG are very sensitive to the representations the impact of clouds and oceans, since their effects are complex and not well understood. While some MCG are specially designed to simulate the behavior water in the clouds, limited vertical resolution (ie, does not rise enough) and low horizontal resolution (ie, the activity of clouds of large areas of the Earth is averaged together and this average is used for the whole area) to prevent even these thin models from cloud cover with precision and some training processes clouds. More simulations were carried out at the beginning of clouds with fixed distributions based on observed data in the cloud cover, but these levels do not allow any fixed exchange of information between the distributions of clouds and the change in atmosphere / ocean temperatures and movements. Problems in the cloud of return is seen as the Achilles heel of MCG. Similarly, the representations of the ocean were initially crude, in some models, a swamp (standing, heat-absorbing heat and steam of the body-the release of water) was used as the ocean model. Later models had a slab thickness of 50 meters of sea that allows the storage of heat in summer and release heat during the winter. While not including ocean currents (caused by the movement of heat to cooler parts of the ocean), these models attempted represent the seasonal temperature response in the upper ocean, but the lack of currents result in too warm tropical oceans and regions polar too cold. Even today most sophisticated computer climate models are still only approximations severe experimental numerical of highly complex atmosphere-ocean-biosphere and cryosphere system. And yet, these general circulation models are the basis of the theory of global warming if for no other reason than the near impossibility of conducting physical experiments worldwide (Pielke Cotton &.)
The main evidence of these climate climate mathematical models is to take data from previous years, implementation of programs and see if the computer results are close the actual data present climate. The problem is that data are not exactly accurate. When the predicted global warming between 0.5 ° C at 4 ° C, accuracy data is important, to say the least. Satellite data (see part) is called by some researchers do not substantial for the short length of their records, but Phil Jones that the lack of even the records of global temperature surface (about 100 years) helps to uncertainty in the field. Interestingly, the current temperature measurements surface have shown a 0.5 oC warming in the last century, but satellite measurements over the past fifteen years (only satellite data has been available for nineteen years) shows a slight downward trend. Satellite temperature trends varies smoothly, while some surface data, a region are getting used while the regions around it seems to cool. According to Dr. Roy Spencer, a scientist at NASA, "We excursions important [the trend] because of volcanic eruptions as [Monte] Pinatubo and ocean current phenomena like El Nino, but overall the trend is approximately 0.05 degrees Celsius per decade cooling "(Horack and Spencer). Earlier this year, he realized that satellite data needed for the correction of orbital decay, or "downward drift" in the satellites to show cause erroneous cooling in the data. However, even after careful adjustment of the trend is still 0.01oC cooling per decade, while weather balloons are -0.02 and-0.07oC per decade in Britain and America, respectively, and the UK data show a warming of surface 0.15oC per decade. The Intergovernmental Panel on Climate Change (IPCC) estimated climate model predictions of surface warming per decade is 0.18oC and warming in the deep layer measured by satellites and weather balloons by about 30% faster, or 0.23 ° C per decade. None of the satellites and weather balloons show values anywhere near it, or even when the satellite record set is updated through July 1998 show a trend of 0.04 ° C per decade, which is still only a sixth of the IPCC-predicted rate (Spencer).
Even while the satellites may require adjustments in their data for changes in the orbit, this data is even more accurate than data surface. The satellites do not have anything in your environment to skew the data. Furthermore, many sources of error exists on Earth. Things seem so minuscule as the change in color and type of paint used for shelters instrument can skew the data slightly for the different types and paint colors absorb small amounts, but different solar radiation. As another example, the urban heat island effect is known that cities are warmer at night and softer during the day. The growth of in urban areas during this century has led to a bias 0.4oC in U.S. climate record, making the amount of warming appear larger than it was (Cotton and Pielke). Thomas Karl, climatologist for the National Oceanic and Atmospheric Administration (NOAA), demonstrated in a 1989 document, if the surface temperatures have been corrected for the urban heat island effect, in the years around 1940 emerge as the warmest, with readings since then have shown a downward trend (Crandall). If this trend exists in global climate data set, its use to represent a wider geographical record of climate change studies could lead to confusion.
Another factor affecting largely ignored the temperature data is solar variation or periodic changes in brightness of the sun based on sunspots, etc. Some climate modelers say that the Sun only varies with a cycle of 11 years, and this period is too fast for the climate system to respond. Hoyt notes that explosive volcanic eruptions are radiative one to two years long to force seem to affect the climate, and solar and variance should have a major impact on climate. James Hansen, the famous modeler at NASA, put it this way: "anthropogenic greenhouse gases (GHGs), which are well measured, because a strong positive (warming) forcing. But other, poorly measured, anthropogenic forcings, especally changes of atmospheric aerosols, clouds, and other patterns land use, causes a negative forcing tends to offset greenhouse warming. One consequence of this partial balance is that natural forcings to changes in solar radiation can play a greater role in long-term climate change to be deducted from greenhouse gases alone "(NASA). Current research of Daniel Cayan and Warren White, of the Scripps Institution of Oceanography shows that "the rise and fall of the sun" may be behind environmental changes. Studied North Pacific sea surface temperature over the past 50 years and realize that their pattern resembled much to the satellite record of solar radiation (Kerr – New). Based on this, seems logical to include such effects in general circulation models, but few researchers do.
Moreover, any warming calculated is reduced by the cooling effect of volcanoes. Although we can not predict the occurrence of a volcanic eruption, we have enough statistical information on past eruptions to estimate the mean effect of cooling, however this is a on several factors not specifically considered by the IPCC (Singer – Scientific) and many other models.
If these models are wrong in their assumptions about the climate, everything that is thought to be known through them is wrong. However, if your assumptions are correct, but essential factors or the effects on the global system are being omitted from the study, then general circulation models believe that a mistake of fact may only need to set a visionary. By Unfortunately, the lighting is difficult to find in this field. Many, many things are still unknown.
Effects of global warming on our lives daily
Another area where uncertainty rears its head is in the realm of "real life" effects of global warming. Possible effects of global warming have been played in the media: the hurricanes, plagues, a large increase in sea level, etc. Some scientists refute this assertion. But again, because climate models can tell us a little with certainty so we can not know for sure if global warming that have these effects or not.
Some researchers, such as those involved with the IPCC, say that global warming will lead to an increase in violent storms such as hurricanes and typhoons. But, as S. Fred Singer exit points (Scientific), warming would actually lead to a reduction of these storms as differences in Ecuador to pole temperature decrease, since this is the heterogeneity that drives atmospheric temperature and makes storms stronger.
Record-breaking temperatures are given by others as a consequence global warming. But what really are the consequence of breaking records, on an average day, 2 million square kilometers (equivalent to an area of 1400 miles by 1400 miles) from Earth is experiencing climate record breaking 100 years of age. In fact, the probability of breaking a record time is equal to 1 / N, where n is the number of years for which records exist (Hoyt).
Certain, as the virologist Robert Shope, say warming could result the mosquito carrier of dengue and yellow fever to emigrate north, causing epidemics in North America. Cholera (which are known to live in the plankton in the sea) says, could become epidemic in the United States as changes in marine ecology and encourage the growth of pathogen transmission. Rita Colwell, Paul Epstein, and Tim Ford, another group of researchers went a step further and blamed the warming of El Niño in the Pacific, at least in part by a 1991 epidemic affecting Latin America 500 000 cholera and killing nearly 5,000. However, cholera is known to spread from person to person through other foods, water and Lee, why are the cholera epidemics that public health and sanitation are broken. CDC medical epidemiologist Fred Angulo said that "We had a powder keg about to burst, a whole continent in which it was prepared sanitation and water supply and all for the transmission of this organism once it is introduced " possibly from ships emptying the bilge water near the fishing areas. He adds that cholera has been introduced in the U.S. at the time the last several years, never left "because we have public health and sanitation infrastructure to prevent it."
As for the mosquito-borne diseases, epidemiologist Mark L. Wilson of the University of Michigan-Ann Arbor, said that the predictions suffer from many levels of uncertainty. No one disputes that weather patterns have a impact: "There is no reason to believe that if this is a very wet spring, the summer mosquito populations are increasing," but he and his colleagues point no one knows exactly how temperature and precipitation patterns will change in a warmer world, or how these changes affect the biology of disease. Paul Epstein has attributed the epidemics of dengue in Latin America in 1994 and 1995 with El Niño and global warming but experts on dengue in the Pan American Health and the Centers for Disease Control and Prevention say these epidemics as a result of a break in the eradication of specific species of mosquito responsible and returned. Epidemics caused by mosquitoes once in the U.S. have disappeared due to mosquito control, eradication programs, systems running water, and lifestyle changes (we have good housing, air conditioning and TV to keep within us, and screens to keep mosquitoes out). They point as an example the 1995 dengue pandemic Mexican stopped at the Rio Grande, with over 2,000 confirmed cases in Reynosa, Mexico, but only 7 to across the river in Texas. And what's a little early to tell, like the IPCC, that "climate change can have wide-ranging impacts and adverse effects on particularly in human health with significant loss of life "(Taubes).
It is interesting that there seems to be a rise in sea level along the coasts. According to Robert T. Watson, chairman of the IPCC, "Let's see the sea level could displace tens of millions of people … and … the whole island could be significantly flooded. The coasts of America could be severely attacked. "But Dr. David Aubrey, oceanographer and scientist at the Woods Hole Oceanographic Institute in Massachusetts, states that "I have not seen any convincing evidence that recent increases in sea level caused by effects on humans or global warming" (Hoyt). Y estimates of defenders including global warming "have been falling steadily, initially, was designed by the EPA that a doubling of atmospheric CO2 could cause 80-120 inches tall, but by 1990 the estimate was for a quarter of that. In 1996, a scientific advisory group of the United Nations, predicted a rise of only 15 to 22 cm by the year 2100. Even the smallest estimates are quite uncertain, for changes in sea level are extremely hard measure. Historical data are based on indicators of tides, which are mainly from northern Europe and North America. The long-term trends is found only after the figures are adjusted by the waves, storm surges, and tidal variations (Singer – Sky). In addition, the land itself may be rising or falling. Atlantic Coast Middle of USA, for example, is falling as a bulge formed by Ice Age glaciers slowly is installed, according to the Detroit News in 1996 (Hoyt). Record global sea level as shown rebuilt and adjusted interesting trend: the rates have been increasing by about seven inches per century for several centuries on which much fluctuation in the global climate has occurred. It is now believed that slow tectonic changes have resulted in steady growth, not the melting of the glaciers some theorists propose global warming. Indeed, the World Glacier Monitoring Service in Zurich found that between 1926 and 1960, when the planet was supposedly colder than at present, 70% of U.S. and glaciers retreated. Since 1980, however, 55% of these glaciers have advanced it (Carlisle). It does not support theory that global warming is a fact now, is melting glaciers and the water is causing a rise in sea level. While global warming can cause melting mountain glaciers and thermal expansion of water, the acceleration of physical location, can also cause more water to evaporate surface warmer oceans, leading to increased rainfall and a thickening of the polar ice sheets. Data from the period 1900-1940 the sample heating caused by a fall in sea level, while the subsequent cooler period showed an increase in sea level (Singer – Sky).
Other areas of life, global warming has an effect on those affected by attempts to stop global warming. Some people (Clark Kerr – Effect Report gases) suggest that small changes, such as using high efficiency compact fluorescent lights, using the self-powered or the public transport more often etc, could make a big impact on the global warming problem (assuming it exists). This would agree with the idea expressed by some scientists that the only actions to be taken until there are safer is (or should) be taken anyway. But, do people do these things if not necessary? Some other scientists are more pessimistic.
further steps are suggested by them. As the state cotton and Pielke in human impacts on Weather and Climate "Clearly, reductions in CO2 emissions in these countries [U.S., China, and the former Soviet Union] will have a significant impact on emissions Global CO2 and reduce the likelihood that human activity will have a significant impact on weather and climate. "By working with a matter so uncertain, only can measure the risks, see the costs and benefits of all alternatives and make a guess more competent than the best course of action. In the face of all this uncertainty, I would propose a sort of bet climatologists' (a variation of Pascal's wager on this issue.) Let's assume for a moment there is global warming happens. If this is the anthropogenic global warming, and will have a negative impact on climate and life, then we must take action. If this is not anthropogenic warming and global warming will have a negative effect on the climate and life, nothing can be done. If there is no anthropogenic global warming and global warming will have no effect negative climate and life, nothing needs to be done. Similarly, if humans have contributed to global warming, but will have a negative impact on climate and life, no action required.
But there is another dimension to choose what to do: assuming that anthropogenic global warming is happening, and that have a negative impact of climate and life, one must weigh the costs and benefits of maintaining this risk against the cost and benefits of action. Take the Kyoto Protocol as an example. President Clinton signed on November 12, 1998, but is hoping to give the Senate. This agreement, if ratified by the Senate, would force the U.S. to reduce emissions of greenhouse gases (mainly CO2) to 7% below 1990 levels within the next 10-14 years. This reduction costs mandatory emissions are substantial. Compliance would cost the U.S. 3.3 trillion U.S. dollars from 2001 to 2020, or $ 30,000 per household. Gas prices are expected an increase of 65 cents per gallon or more. Michigan residents expected to have to pay 77.3% more for home heating oil, 73.5% more for natural gas, and 64.2% more for electricity. Industries and businesses will suffer. It is believed that some of the most affected sectors include high consumption energy production (such as automobiles, cement, iron, steel, chemicals, aluminum, etc), transport, telecommunications, paper and related products petroleum refining and utilities. Salaries and wages would fall, while the costs of food, shelter and medicine rose. The state of Michigan lost 96,500 jobs work (49 800 in industry), 9.3 billion U.S. dollars in production, and $ 3.4 billion in tax revenues, reduced capacity the State to provide further a great need for social services. It is expected that the unemployment rate would reach 5.5% and 1.1 million U.S. jobs is lost (Novak, Littmann).
This would be a bleak picture if these changes were known to be necessary for survival. However, a much bleaker picture is one to go through this economic difficulties in an unproven theory, then discover that potentially costly changes this really had a negligible effect on climate and life as a whole. There is no scientific understanding of what level of greenhouse gases is "dangerous." How can we, then, regular what the level should be, not knowing if the danger is above or below the standard that would set? Otherwise, how can the 1992 World Climate Treaty that its aim is "to stabilize concentrations of greenhouse gases in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system "(Singer – scientific)? also seems a bit odd that only a fast growing, prosperous society would be better able to acquire the technology to become more clean and healthy, and safe, but certainly this treaty to that effect to the U.S. economy. By not sanctioning countries developing, Kyoto almost encourages industry to move from reasonably efficient and regulated developed countries and developing countries, which have few (if the regulations) on pollution. S. Fred Singer has an interesting idea in "The dangers of global climate treaty:" This [the Kyoto Protocol] has been rightly qualified transfer of money from poor people in rich countries to rich people in poor countries. "Meanwhile, climate scientists who support the theory anthropogenic global warming is unlikely that the Kyoto Protocol even temporarily, reducing the accumulation of greenhouse gases in the atmosphere. Jerry Mahlman, director of the Geophysical Fluid Dynamics Laboratory in Princeton, says that "may be needed during the coming 30 century Kyoto" to reduce global warming to a size (Malakoff).
Reality and Fiction:
MYTH: Even if the Earth is warming, not we can be sure how much, if any, of the warming is caused by human activities.
FACT: No international scientific consensus of most the warming in the last 50 years is due to human activities, not natural causes. During million years, animals and plants lived, died and was compressed to form large deposits of oil, gas and coal. In little more than 300 years, however, have burned a large amount of carbon stock for delivery energy.
Today, the byproducts of fossil fuel use – billions of tons of carbon (as carbon dioxide) methane and other greenhouse gases – form a blanket around the Earth, trapping heat from the sun, raising temperatures abnormally in the ground, and constantly changing our climate.
The impacts associated with this seemingly small change in temperature are evident in all corners of the globe. There is heavier rainfall in some areas and drought in others. Glaciers are melting, spring comes earlier, the oceans are warming, and coral reefs are dying.
MYTH: The Intergovernmental Panel on Climate Change predicts a rise in average global temperature of only 1.4 ° C to 5.8 ° C in the next century.
This small change, less than the current daily temperature range of the most important, is not a concern.
FACT: The temperature overall average is calculated from temperature readings around the Earth. As the temperature varies considerably from day to day in one place, the average temperature the world is remarkably constant. According to the analysis of ice cores, tree rings, pollen and other "climate proxies, average temperature northern hemisphere had moved up or down a few tenths of a degree Celsius between 1000 and around 1900 AD, when it began a rapid warming.
A change in average temperature between 1.4 ° C to 5.8 ° C would result in climate-related effects that are much larger and faster than any that have occurred during 10 000 years history of civilization.
Scientific analysis of past centuries, we know that even small changes in average global temperature can cause large climate change. For example, the average global temperature differences between the end of last ice age (when much of the northern hemisphere was buried under thousands of feet of ice) and interglacial climate today is only about 5 ° C.
MYTH: Heating can not be due to greenhouse gases, because changes in temperature and changes in emissions of greenhouse gases over the last century there was no way simultaneously.
FACT: The slow warming of the oceans generate significant time lag between when carbon dioxide and other greenhouse gases are emitted to the atmosphere and when changes in temperature.
This is one of the main reasons why we do not see changes in temperature, while the changes in emissions of greenhouse gases. You can see in miniature the same process takes place when heating a pot of water on the stove: there is a lag between the time light the flame and when the water starts to boil.
Moreover, many other factors that affect year to year variation in the temperature of the Earth. For example, volcanic eruptions, El Niсo, and small changes in the sun may affect global climate on an annual basis.
Therefore, you would not expect that the accumulation of greenhouse gases that exactly match the trends in global climate. However, scientific evidence clearly indicates anthropogenic (Or human) greenhouse gases as the main culprit of climate change.
MYTH: Carbon dioxide is removed from the atmosphere quite quickly, so that if global warming becomes a problem, we can expect to take steps to reduce emissions of greenhouse gases until we began to see the impacts warming.
FACT: Carbon dioxide, a gas created by burning fossil fuels (like gasoline and coal), is the most greenhouse gas important fact to man.
Carbon dioxide from fossil fuels produced in large quantities and can persist in the air for so long as 200 years.
This means that if carbon dioxide emissions were halted today, it would take centuries for the amount of carbon dioxide in the atmosphere and lower than it was in pre-industrial times. That we must act now if we want to avoid the increasingly dangerous consequences of climate change in the future.
MYTH: Human activities contribute only a small fraction of carbon dioxide emissions, an amount too small to have a significant effect climate, especially as the oceans absorb much of the carbon dioxide emissions further.
FACT: Before human activities began dramatically increase the levels of carbon dioxide in the atmosphere, the amount of carbon dioxide emitted from natural sources closely matched the amount to be stored or absorbed through natural processes.
For example, as forests grow, they absorb carbon dioxide from the atmosphere through photosynthesis, the carbon is then sequestered in wood, leaves, roots and soil. Some carbon is then released into the air when leaves, roots and wood die and decompose.
Carbon dioxide also cycles through the living sea surface plankton in the oceans absorb carbon dioxide through photosynthesis. Plankton and the animals that feed on plankton then die and fall to the bottom of the ocean. As the decay, the carbon dioxide released into the water and returns to surface through ocean currents. As a result of these natural cycles, the amount of carbon dioxide in the air had changed very little over 10,000 years. But this balance is altered by man.
Since the Industrial Revolution, the burning of fossil fuels like coal and oil has twice carbon dioxide into the atmosphere which is naturally removed by the oceans and forests. This has led to levels of carbon dioxide accumulating in the atmosphere.
Today, carbon dioxide levels are 30% above pre-industrial levels, higher than they have been in the last 420,000 years and likely are at the highest levels in the last 20 million years. Studies of climate history of Earth have shown that even small changes in natural Carbon dioxide levels are generally accompanied by significant changes in global mean temperature.
We have experienced an increase of 1 C in temperature Overall in the last century, and we can expect a significant warming in the next century unless we act to reduce emissions of greenhouse gases.
MYTH: The Earth has warmed rapidly in the past without dire consequences, so society and ecosystems can adapt easily to any anticipated heating.
FACT: The Earth experienced a rapid warming in some places at the end of the last glacial period, but during the last 10,000 years climate has been relatively stable. During this period, such as agriculture and civilization developed, world population has grown enormously. Now, many populated areas such as shopping urban coastal lowlands are highly vulnerable to climate change.
In addition, many ecosystems and species are already threatened by the current pressures (such as pollution, habitat conversion and degradation) may be even more pressure to the point of extinction by climate change.
MYTH: The buildup of carbon dioxide will lead to a greening of the Earth because plants can use carbon dioxide to accelerate growth further.
FACT: Carbon dioxide has been shown to act as fertilizer for some plant species under certain conditions. In addition, a longer growing season (due to warmer temperatures) may increase productivity in some regions.
However, it also There is no evidence that plants can acclimate to higher levels of carbon dioxide – which means that plants can grow faster for a short time only before returning to previous levels of growth.
Another problem is that many of the studies in which plant growth due to fertilization Carbon dioxide is carried out in greenhouses where other nutrients that plants need to survive, were adequately supplied.
In nature, plant nutrients such as nitrogen and water are often difficult to obtain. So, even if the plants have extra carbon dioxide available their growth may be limited by lack of water and nutrients. Finally, climate change itself could lead to decreased plant growth in many areas due to increased drought, floods and heat waves.
Whatever the carbon dioxide fertilization can bring benefit, is unlikely to be anywhere near enough to counter the adverse effects of climate changes rapidly.
MYTH: If the Earth has warmed since the pre-industrial era, it is because the sun's intensity has increased.
FACT: The intensity of the sun varies. In the late 1970s, sophisticated technology was developed that can measure directly from the sun intensity. The measurements of these instruments show that in the past 20 years the sun's variations have been very small.
Indirect measures of changes in the intensity of the sun since the beginning of the industrial revolution in 1750 show that variations in the intensity of the sun does not have into account all the warming that occurred in the 20th century and most of the warming was caused by increased human emissions of greenhouse gases.
MYTH: It's pretty difficult to predict the weather a few days in advance. How can we have confidence in projections of climate a hundred years from now?
FACT: Climate and weather are different. Weather refers to temperatures, rainfall and storms in a given day at a particular location. Climate reflects half Long-term, sometimes over a large area like a continent or even the entire earth.
Averages over large areas and time periods are easier estimate that the specific characteristics of the climate.
For example, although it is very difficult to predict whether rain or the exact temperature of any particular day in a specific place, we can predict with relative certainty that on average, in the northeastern United States will be colder in December than in July.
In addition, Climate models are sophisticated enough to be able to recreate past climates, including climate change over the last hundred years. This is in addition to our confidence in projections of future climates are accurate.
Finally, when climate projections is presented, using a series of model results climate represent the limits of our projections (What is the average global temperature could change at least what is the average temperature over could global change), and our degree of certainty of the projections.
MYTH: The science of global climate change can not tell us the amount by which emissions man of greenhouse gases must be reduced to stop global warming.
FACT: The UN Framework Convention on Climate Change indicates that emissions of greenhouse gases should be limited to avoid "dangerous interference with the climate system." Scientists have tried to define further what constitutes "dangerous interference."
One study (O'Neill and Oppenheimer, 2002) provides three criteria that can be used:
1) the risk for threatened ecosystems such as coral reefs
2) large-scale disruptions caused by changes in the climate system, such as elevation sea level caused by the breaking of the ice sheet of Antarctica and
3) large-scale disruptions of the climate system itself, such as closing the Atlantic Ocean thermohaline circulation (Gulf Stream), which would lead to a severe drop in temperature to Europe.
This work provides that if the concentration of C02 have a limit of 450 parts per million (ppm), the major alterations in the climate system can be avoided, although some damage (For example, that coral reef) may be unavoidable.
Current estimates of atmospheric CO2 concentrations likely to be achieved without action aggressively to limit emissions of greenhouse gases are much higher – from 550 ppm to as much as 1000 ppm in the next hundred years.
MYTH: Because the uncertainty of climate models, it is very difficult to predict exactly what the regional impacts will result from global climate change.
FACT: According to the IPCC, some trends of the climate is very likely to happen if emissions of greenhouse gases continue at the current rate or increase: sea level rise, increased droughts in some areas, floods in others, temperatures will rise, which leads to heat waves becoming more common and glaciers likely to melt at a faster pace.
Regional impacts are likely to occur, but exactly when and what is more difficult to predict.
This is because:
1) regional climate models are more equipment intensive than global climate models – which take longer to run and are more difficult to gauge, and
2) many non-climatic factors contribute to the impacts at regional level. As such, the risk of mosquito-borne diseases as dengue fever and malaria may increase due to rising temperatures, but the actual risk of infection depends largely on the effectiveness of measures public health in place.
A Better World Climate: How do we get there from here?
As noted above, there are a number of unanswered questions about global warming. We wonder if there really is an anthropogenic global warming or the threat of one, because we have the perfect model for climate telling us. And we have this model because we do not understand what is happening, we do not understand how it interacts with the ocean-atmosphere system, the terrestrial biosphere, cryosphere, or any other contributing factors. Therefore, the investigation should be first in our minds is that to understand better relationships between the rich of those bodies and the different characteristics of each, which may not be well understood. The effect of clouds, for example, in heating and vice versa, are not understood very well. Just plain cool by reflecting heat back into space, or is its role more complex than that? What does each shape and size of the cloud have? Which external factors have an effect on the formation of clouds? And, most importantly, how can we relate these greater impact on general circulation models?
Similarly, aerosols have a need to study. "Just cause cooling by reflecting radiation sun back into space, or, as one researcher, is that nullified the effect of heating through the Earth's reflection of the radiation back to earth and give his real cooling effect by fortifying the clouds with water droplets, giving them a higher albedo?
Are the variations in solar radiation and sunspot cycles behind all or part of the perceived global warming? Could be changes in the production of energy from the sun warming, as some have observed?
How does the tropical ocean interact with the global atmospheric circulation, as tropical cyclones (hurricanes) are there? Is there a special process at work is affecting the global warming theory? Similarly, what the atmosphere, ocean and sea ice interact in the high latitudes?
What, exactly, the terrestrial biosphere of place in the carbon cycle? How much CO2 is different types of vegetation, soil or rock to absorb? If CO2 is shown to be a major problem, there would be some way to make some of the terrestrial biosphere to take more CO2? What effect would that have involved in different ecosystems?
And again and again the possible questions to go. As seen above, there are a lot research addresses global warming may come and go in. All this would be useful to try to better determine the climatic direction we as a planet target in. However, there is another dimension to this attempt to better understand global warming: the modeling. Today, even the most sophisticated and covers the MCG is incredibly crude and simplified compared with real atmospheric system and its feedback. And so, taking into account new research findings related to these topics and others, we must continue to update the models. We must continue working on the models, improving them, until the corrections of flow or "sweet of factors, "as they are called, are not required to perform adequately predict the conditions of today. As computer technologies become more continuously smaller and faster and more capable of complex systems, we further reduce the scale of the models, the introduction of more variables to explain or better more detailed understanding of the existing variables. For a perfect model, each variable, each eddy ocean and sulfate particles would have to be taken into account. While this is unlikely as a state of modeling, we can keep trying to explain what is happening and how things are connected and interrelated putting bigger and better understanding of the complex atmospheric modeling table.
Unfortunately for these global climate change research, the computer industry is not moving nearly fast enough for this research. In many ways, climatologists are waiting in the computer industry to build more powerful supercomputers that could make the models more complex to use that computing power. And yet, there are at least a slight edge waits: many valuable studies are conducted with the innovative and legitimate methods simply have not been collecting data long enough to be as helpful as possible. The satellite data is a good example. If you wait, the data will be better.
And so, we can see that the science behind global warming is far from resolved. Much is unknown and conflicting theories abound, as often happens in scientific forums. New ideas and new studies science kept changing global climate, keep second guessing themselves, so that it looks like the newest and best ways to explain what's happening. Finally, global climate change can be a way for science to prove can work well, even under the most uncertain of the circumstances. <! – / Message ->
[Removed] / /
<! [CDATA [/ / <! [CDATA [google_ad_client = pub-8827297375521878 "google_ad_width = 336; google_ad_height = 280; google_ad_format = "336x280_as" google_ad_type = ""; google_ad_channel = "1389449785" google_color_border = "F7F7F7"; google_color_bg = "F7F7F7"; google_color_link = "054b1d" google_color_text = "000000" google_color_url = "000000"; google_ui_features = "Rc: 0" / /]]> [deleted] [deleted] [deleted] [REMOVED] / / <! [CDATA [/ / <! [CDATA [google_protectAndRun (Ads_core.google_render_ad "google_handleError, google_render_ad) /]]>
[Deleted]
About the Author
Nadeem Wagan
writer of Pakistan
Jimmy Flynn’s Pub, ‘Celtic Snug’ in White Rock, St.Patrick’s Day
