Some of the Australians are from the subtropics and are now getting their first taste of snow.
BBC: Wounded soldiers train in Iceland for South Pole race
Coral reefs exist in over 50 countries and they stretch across much of the tropics and subtropics.
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Currently three billion people live in the tropics and subtropics, and their number is expected nearly to double by the end of the century.
BBC: Heat may spark world food crisis
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