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Global warming refers to the increase in the Average Temperature of the Earth's near-surface air and Ocean s in recent decades and its projected continuation. The global average air temperature near the Earth's surface rose 0.74 ± 0.18 ° C (1.33 ± 0.32 ° F ) during the last 100 years. The Intergovernmental Panel On Climate Change (IPCC) concludes, "most of the observed increase in globally averaged temperatures since the mid-20th century is very likely Due To the observed increase in Anthropogenic greenhouse gas concentrations"1 via the Greenhouse Effect . Natural phenomena such as Solar Variation combined with Volcano es probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward. |
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