Kamis, 13 Agustus 2009

Global Warming

Global warming is the process of increasing the average temperature of the atmosphere, ocean, and Earth's land.

Global average temperature at Earth's surface has risen 0.74 ° C ± 0:18 (1:33 ± 0:32 ° F) during the last hundred years. Intergovernmental Panel on Climate Change (IPCC) concluded that "most of the increase in global average temperatures since the mid-20th century most likely caused by increased concentrations of greenhouse gases due to human activities" [1] via the greenhouse effect. These basic conclusions have been raised by at least 30 scientific and academic bodies, including all the national science academies of the G8 countries. However, there are still some scientists who disagree with some of the conclusions of the IPCC noted.

Climate models referenced by the IPCC project suggests global surface temperatures will rise 1.1 to 6.4 ° C (2.0 to 11.5 ° F) between 1990 and 2100. [A] difference in estimates was caused by the use of different scenarios of greenhouse gas emissions greenhouse gases in the future, as well as models of different climate sensitivities. While most research focuses on the period up to 2100, warming and sea level rise is expected to continue for more than a thousand years even if greenhouse gas emission levels have been stable. [1] This reflects the large heat capacity of the oceans.

Rising global temperatures are expected to lead to other changes such as rising sea levels, increased intensity of extreme weather phenomena, [2] as well as changes in the number and pattern of precipitation. Consequences of global warming is another terpengaruhnya agricultural output, loss of glaciers, and the extinction of various animal species.

Some of the things that scientists are still doubtful about the amount of warming predicted to occur in the future, and how warming and changes that occur will vary from one region to another. Until now still going political and public debate in the world about what, if any, action should be taken to reduce or reverse further warming or to adapt to the consequences that exist. Most governments in the world have signed and ratified the Kyoto Protocol, which leads to the reduction of emissions of greenhouse gases.

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