Models
Recent models 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. As ocean waters expand in response to this warming, global sea levels 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.
Read more about this topic: Climate Commitment
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