Melting glaciers

Global surface temperatures increased by 0.8°C on average during the 20th century and twice as much in the Arctic and sub-polar areas. This warming does not appear that large considering day-to-day temperature fluctuations, but as a change in mean annual temperature it has substantial consequences, resulting for example in melting of sea-ice and glaciers, rising sea levels, enhanced vegetation growth in temperate regions and changes in migratory routes of birds and animals.

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