Well I could tell you that the global warming gonna destroy us we can do the difference being good persons and helping earth.
Here is a video for reflexe:
martes, 22 de noviembre de 2011
What Will Happen If Global Warming Is Not Stopped?
What's Happening?
- 1
Earth, like any planet, has gone through changes in its long history as it has cooled from a molten ball, developed a crust and atmosphere, thrown up mountains and formed the lands and seas as we know them. Throughout this process, the climate has warmed and cooled, with only a few degrees variation in average temperature making the difference between vast tropical areas and periods of marching glaciers. In the last three centuries, however, these cycles have been disrupted. The cool periods known as "little ice ages" that separate warm periods have been eliminated, and average temperatures have steadily increased.
Scientists disagree on the causes, but the statistics kept over the last 100 years show a general increase in the earth's temperature that corresponds with human population growth, industrialization and use of fossil fuels. The Intergovernmental Panel on Climate Change (IPCC) estimates that the probability that global warming is due to natural climate change alone is less than five percent. Whether or not human-related (anthropogenic) factors are causative factors, the reality is that the average temperatures continue to rise and global warming is taking place. The results of continued warming have been projected by the IPCC in a series of reports to the World Meteorological Organization and the UN Environmental Programme.
Changes We Can See
- 1We can already see the results of warmer temperatures in Africa, along tropical coasts and in the great Wheat Belt of the American Midwest. The desert is encroaching on the fertile African veldt, displacing the Masai, who have kept cattle there for centuries. Catastrophic hurricanes occur with less and less time between them. Severe storms, tornadoes and straight-line winds have been more numerous. The sea ice and glaciers are retreating, threatening wildlife habitat and water supplies. Certain species are disappearing, and some (like the polar bear) are endangered because of diminished habitat.
Changes Over Time
- 1Over time, major climate shifts have spelled the end of species. Climate shift is thought to have played a part in the demise of the dinosaurs. The rise of 2 to 11 degrees Fahrenheit projected over the next century would result in continued melting of the polar caps, freeing methane locked in prehistoric ice. Increased sea levels would flood low-lying areas of Europe and the United States. The IPCC foresees extreme heat waves and droughts in middle-latitude continental areas as heat creates new deserts, heavy rainfall in temperate areas and high tides and heavy storms on the edges of the continents. Atmospheric conditions that have changed over the last 300 years with industrialization will continue to decline. Carbon dioxide, methane and nitrous oxide are only a few of the compounds that could make the air too toxic to sustain life as we know it. If history is any guide, species will die off as the climate and chemistry of the earth change, from the most fragile (birds and butterflies) until the most resilient and adaptable (humanity) is threatened.
Read more: What Will Happen If Global Warming Is Not Stopped? | eHow.com http://www.ehow.com/how_4608851_happen-global-warming-not-stopped.html#ixzz1eU3JsLFH
Global Warming
Global warming
Global warming refers to the rising average temperature of Earth's atmosphere and oceans and its projected continuation. In the last 100 years, Earth's average surface temperature increased by about 0.8 °C (1.4 °F) with about two thirds of the increase occurring over just the last three decades.[Warming of the climate system is unequivocal, and scientists are more than 90% certain most of it is caused by increasing concentrations of greenhouse gases produced by human activities such as deforestation and burning fossil fuel. These findings are recognized by the national science academies of all the major industrialized countries.
Climate model projections are summarized in the 2007 Fourth Assessment Report (AR4) by the Intergovernmental Panel on Climate Change (IPCC). They indicate that during the 21st century the global surface temperature is likely to rise a further 1.1 to 2.9 °C (2 to 5.2 °F) for their lowest emissions scenario and 2.4 to 6.4 °C (4.3 to 11.5 °F) for their highest.The ranges of these estimates arise from the use of models with differing sensitivity to greenhouse gas concentrations.
An increase in global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, and a probable expansion of subtropical deserts.[11] Warming is expected to be strongest in the Arctic and would be associated with continuing retreat of glaciers, permafrost and sea ice. Other likely effects of the warming include more frequent occurrence of extreme weather events including heatwaves, droughts and heavy rainfall events, species extinctions due to shifting temperature regimes, and changes in agricultural yields. Warming and related changes will vary from region to region around the globe, though the nature of these regional changes is uncertain.[citation needed] In a 4 °C world, the limits for human adaptation are likely to be exceeded in many parts of the world, while the limits for adaptation for natural systems would largely be exceeded throughout the world. Hence, the ecosystem services upon which human livelihoods depend would not be preserved.[12]
Proposed responses to global warming include mitigation to reduce emissions, adaptation to the effects of global warming, and geoengineering to remove greenhouse gases from the atmosphere or reflect incoming solar radiation back to space. The primary international effort to prevent dangerous anthropogenic climate change ("mitigation") is coordinated by the 194-nation UNFCCC.[13] The Kyoto Protocol is their only legally binding emissions agreement and only limits emissions through the year 2012.[14] Afghanistan and the USA are the only nations in the UNFCCC that have not ratified the original protocol,[15] and as of October 2011 several others have refused to extend the emissions limits beyond 2012.[16] Nonetheless, in the 2010 Cancun Agreements, member nations agreed that urgent action is needed to limit global warming to no more than 2.0 °C (3.6 °F) above pre-industrial levels.[17][B] Current scientific evidence, however, suggests that 2°C is the "threshold between ‘dangerous’ and ‘extremely dangerous’ climate change",[18] that this much warming is possible during the lifetimes of people living today,[19] and that steep reductions in global emissions must be made by 2020 in order to have a 2-out-of-3 chance of avoiding global warming in excess of 2°C.[
Global warming refers to the rising average temperature of Earth's atmosphere and oceans and its projected continuation. In the last 100 years, Earth's average surface temperature increased by about 0.8 °C (1.4 °F) with about two thirds of the increase occurring over just the last three decades.[Warming of the climate system is unequivocal, and scientists are more than 90% certain most of it is caused by increasing concentrations of greenhouse gases produced by human activities such as deforestation and burning fossil fuel. These findings are recognized by the national science academies of all the major industrialized countries.
Climate model projections are summarized in the 2007 Fourth Assessment Report (AR4) by the Intergovernmental Panel on Climate Change (IPCC). They indicate that during the 21st century the global surface temperature is likely to rise a further 1.1 to 2.9 °C (2 to 5.2 °F) for their lowest emissions scenario and 2.4 to 6.4 °C (4.3 to 11.5 °F) for their highest.The ranges of these estimates arise from the use of models with differing sensitivity to greenhouse gas concentrations.
An increase in global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, and a probable expansion of subtropical deserts.[11] Warming is expected to be strongest in the Arctic and would be associated with continuing retreat of glaciers, permafrost and sea ice. Other likely effects of the warming include more frequent occurrence of extreme weather events including heatwaves, droughts and heavy rainfall events, species extinctions due to shifting temperature regimes, and changes in agricultural yields. Warming and related changes will vary from region to region around the globe, though the nature of these regional changes is uncertain.[citation needed] In a 4 °C world, the limits for human adaptation are likely to be exceeded in many parts of the world, while the limits for adaptation for natural systems would largely be exceeded throughout the world. Hence, the ecosystem services upon which human livelihoods depend would not be preserved.[12]
Proposed responses to global warming include mitigation to reduce emissions, adaptation to the effects of global warming, and geoengineering to remove greenhouse gases from the atmosphere or reflect incoming solar radiation back to space. The primary international effort to prevent dangerous anthropogenic climate change ("mitigation") is coordinated by the 194-nation UNFCCC.[13] The Kyoto Protocol is their only legally binding emissions agreement and only limits emissions through the year 2012.[14] Afghanistan and the USA are the only nations in the UNFCCC that have not ratified the original protocol,[15] and as of October 2011 several others have refused to extend the emissions limits beyond 2012.[16] Nonetheless, in the 2010 Cancun Agreements, member nations agreed that urgent action is needed to limit global warming to no more than 2.0 °C (3.6 °F) above pre-industrial levels.[17][B] Current scientific evidence, however, suggests that 2°C is the "threshold between ‘dangerous’ and ‘extremely dangerous’ climate change",[18] that this much warming is possible during the lifetimes of people living today,[19] and that steep reductions in global emissions must be made by 2020 in order to have a 2-out-of-3 chance of avoiding global warming in excess of 2°C.[
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