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climate change

Global Climate Change

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Mean sea level

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Under the effect of global warming, sea level will rise mainly due to two processes. Firstly, oceans warm and expand. Secondly, melting of glaciers, ice caps and the Greenland and Antarctica ice sheets will raise the sea level.

According to IPCC AR5, global average sea level rose at 1.7 mm per year during the period 1901-2010. The rate accelerated to 3.2 mm per year for the period 1993-2010. The rate of sea level rise since the mid-19th century has been larger than the mean rate during the previous two millennia.

Observed changes in global average sea level

Observed changes in global average sea level from various datasets (relative to the 1900-1905 average value of the longest dataset). Uncertainties are indicated by shading. (Source: IPCC AR5)