| http://www.w3.org/ns/prov#value | - Contemporary Earth system science can explain most of the features of present-day climate and how it has changed over time: why the tropics are warm and the polar regions cold; how the ???greenhouse effect??? of water vapour, carbon dioxide and other trace gases in the atmosphere keeps the Earth???s surface some 70???C warmer than it is 10 km above, where jet aircraft fly, and some 33???C warmer t
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