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Global warming is the increase in the average temperature of the Earth's near-surface air and oceans since the mid-20th century and its projected continuation.

Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 100 years ending in 2005.[1][2] The Intergovernmental Panel on Climate Change (IPCC) concludes that most of the temperature increase since the mid-twentieth century is "very likely" due to the increase in anthropogenic greenhouse gas concentrations.[3][2] Natural phenomena such as solar variation and volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward.[4][5] These basic conclusions have been endorsed by at least 30 scientific societies and academies of science,[6] including all of the national academies of science of the major industrialized countries.[7][8][9] While individual scientists have voiced disagreement with these findings,[10] the overwhelming majority of scientists working on climate change agree with the IPCC's main conclusions.[11][12]

Climate model projections indicate that global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century.[3] The uncertainty in this estimate arises from use of differing estimates of future greenhouse gas emissions and from use of models with differing climate sensitivity. Another uncertainty is how warming and related changes will vary from region to region around the globe. Although most studies focus on the period up to 2100, warming is expected to continue for more than a thousand years even if greenhouse gas levels are stabilized. This results from the large heat capacity of the oceans.[3]

Increasing global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, likely including an expanse of the subtropical desert regions.[13] Other likely effects include increases in the intensity of extreme weather events, changes in agricultural yields, modifications of trade routes, glacier retreat, species extinctions and increases in the ranges of disease vectors.

Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions. Political and public debate continues regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences.

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review by . December 19, 2008
gw1
Global warming is a problem we can't ignore. There are so many little things that we can do to help, yet it seems that nobody is listening to the suggestions being given. I believe that the biggest tool we can use to fight global warming today is education. Many people just aren't aware of the things they can do in their own lives, in their own homes, to combat this threat.    There are many simple things you can do in your daily life - what you eat, what you drive, how …
review by . December 16, 2008
To me, the debate over global warming should be over. If you are hesitant to admit that human beings have a large role in enhancing global warming, then you need to rethink your argument, in my opinion. Personally, I believe that we need to acknowledge that global warming exists and is happening. Whether you want to admit that it's our fault as humans, however, is up to you.    I was raised in a very conservative school district in Southern California where we barely learned …
review by . December 19, 2008
Climate change...right? I mean you give it a jazzy new name and you can market is so much better, no? Its kinda like cooking your favorite dish and you realize your kitchen gets sooo hot because the oven is sooo high. You have the option of turning down the heat or getting out of the kitchen.    It relates to climate change in that we can turn down the heat by finding, enacting, solutions we know to help with the change in our climate or we can get out of the kitchen by running …
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