Global warming - Wikipedia, the free encyclopedia Global warming is the increase in
the average temperature of Earth's near-surface air and oceans since the mid-20th century and its projected continuation. Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) between the start and the end of the 20th centuryGlobal warming controversy - Wikipedia, the free encyclopedia
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