Global warming is the increase in the average tempreture of Earth’s near-surface air and oceans since the mid-20th century. was very likely caused by increasing concentrations of greenhouse gases resulting from human activity such as fossil fuel burning and deforestation.Globalwarming is expected to continue beyond 2100 even if emissions stop, because of the large heat capacity of the oceans and the long lifetime of carbon dioxide in the atmosphere. An increase in global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, is any product of the condensation of atmospheric water vapor that is pulled down by gravity and deposited on the Earth's surface.Probably including expansion of subtropical deserts. Political and public debate continues regarding global warming, and what actions to take in response. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions. The greenhouse effect is the process by which absorption and emission of infrared radiation by gases in the atmosphere warm a planet’s lower atmosphere and surface.The question is instead how the strength of the greenhouse effect changes when human activity increases the concentrations of greenhouse gases in the atmosphere.
Greenhouse effect schematic showing energy flows between space, the atmosphere, and earth's surface. Energy exchanges are expressed in watts per square meter (W/m2).
http://en.wikipedia.org/wiki/File:Greenhouse_Effect.svg
A polar bear standing on a meiting glacier
http://communities.canada.com/vancouversun/blogs/thesearch/2009/04/23/who-cares-less-about-global-warming.aspx
pictures showing factorys that are causing polution
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