Pollution and Health: How Global Warming Process

Thursday, September 2, 2010

How Global Warming Process

Global warming is an increase in average temperature of the air at the Earth's surface and oceans in recent decades and its projected continuation.

The global average temperature at Earth's surface rose 0.74 ± 0.18 ° C (1.33 ± 0.32 ° F) during the last 100 years. The Intergovernmental Panel on Climate Change (IPCC) concludes that "most of the observed increase in global average temperature since the mid-20th century is very likely due to the observed increase in anthropogenic gas concentrations greenhouse gases "by the greenhouse effect.

natural phenomena such as solar changes, combined with volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect since 1950. These basic conclusions have been endorsed by at least 30 scientific societies and academies of science, including all of the National Academy of Sciences of the major industrialized countries. Few scientists disagree with some of the main conclusions of the IPCC.

Climate model projections summarized by the IPCC indicate that average surface temperature will likely rise between 1.1 and then 6.4 ° C (2.0 to 11.5 degrees F) in the 21st century. The range of values using different scenarios of future emissions of greenhouse gases, as well as models with different climate sensitivity. Although most research focuses on the period up to 2100, warming and rising sea levels will continue over a thousand years, even if levels of greenhouse gas emissions are stabilized. Delay in the balance achieved is the result of the large heat capacity of the oceans.

Increasing global temperature will lead to sea level rise and should increase the intensity of extreme weather events and changes in the quantity and type of precipitation. Other effects of global warming include changes in agricultural yields, glacier retreat, species extinctions and increases in the ranges of disease vectors.

The scientific uncertainties remain, including the amount of warming expected in the future, and how warming and related changes depends on the region around the world. Currently, the political and public debate about what is on in the world, if any, action should be taken to reduce or reverse future warming or to adapt to the expected effects. Most national governments have signed and ratified the Kyoto Protocol to reduce emissions of greenhouse gas emissions.

via myclimatechange

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