Global temperature

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In its AR4, WG1 report, Chapter3, the IPCC explains global temperature in these words:

There is no single thermometer measuring the global temperature. Instead, individual thermometer measurements taken every day at several thousand stations over the land areas of the world are combined with thousands more measurements of sea surface temperature taken from ships moving over the oceans to produce an estimate of global average temperature every month. [1]

See also: Climate

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