Thursday, December 3, 2009

Global warming

Global warming increases the average temperature of earths near surface air. The global temperature increases between start to end of the 20th century. The intergovernmental Panel concludes that most of the observed temperature increased since the middle of the 20th century. It was caused by when the increasing concentrations of the green house gases occurring from the human activity. The intergovernmental Panel on Climate Change concludes that variety in natural phenomena such as solar radiations and variations produced most of the global warming from preindustrial times to 1950 and had a small cooling effect when done.