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== Models ==
{{main|global climate model}}
Recent [[model (abstract)|model]]s forecast that even in the unlikely event of greenhouse gases stabilising at present levels, the earth would warm by an additional 0.5°C by 2100, a similar rise in temperature to that seen during the 20th century. More than half of that commitment would be due to natural forcing (Wigley 2005). As ocean waters expand in response to this warming, global [[sea level]]s would mount by about 10 centimetres during that time. These models do not take into account [[ice cap]] and [[glacier]] melting; including those [[climate feedback]] effects would give a 1°C - 1.5°C estimated temperature increase.<ref>{{cite web |url= http://www.nature.com/news/2005/050314/full/050314-13.html |title= Oceans extend effects of climate change |author= Deirdre Lockwood |date= 2005-05-17 |work= |publisher= [[Nature Publishing Group]] |accessdate=2010-05-07}} </ref>
==History==
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