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. MorethanIn half2050, as much as 64% of that commitment would be due to ''past'' natural forcingforcings, and that influence diminishes over time. Overall, the warming committment at 2005 greenhouse gas levels could exceed 1°C.(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>
