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Line 1: − + − − Warming comes and goes in natural cycles of approximately 1,500 years. During these natural periodic increases in the average temperature of the Earth's atmosphere, crops grow better in northern latitudes and deaths from extreme weather decrease. The large arctic island of [[Greenland]] was colonized during the [[Medieval Warm Period]], but the colonies there had to be abandoned during the [[Little Ice Age]] which followed. Line 12:
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moving politics of the Modern Warming Period down to the politics section
[[Image:Rogerrevelle.jpg|thumb|right|200px|[[Roger Revelle]]]]
[[Image:Rogerrevelle.jpg|thumb|right|200px|[[Roger Revelle]]]]
'''Global warming''' is the idea that the Earth has warmed somewhat over the past few decades, and that the warming appears to be related to increases in carbon dioxide and other greenhouse gases. The possibility of adverse consequences has become a major concern for some environmentalists.
'''Global warming''' comes and goes in natural cycles of approximately 1,500 years. During these natural periodic increases in the average temperature of the Earth's atmosphere, crops grow better in northern latitudes and deaths from extreme weather decrease. The large arctic island of [[Greenland]] was colonized during the [[Medieval Warm Period]], but the colonies there had to be abandoned during the [[Little Ice Age]] which followed.
During the recorded history of mankind, these cycles of warming and cooling have occurred every 1,500 years.<ref>''Unstoppable Global Warming'' by [[Fred Singer]] </ref>
During the recorded history of mankind, these cycles of warming and cooling have occurred every 1,500 years.<ref>''Unstoppable Global Warming'' by [[Fred Singer]] </ref>
==Politics of global warming==
==Politics of global warming==
The Earth has warmed half a degree over the past few decades, and to some the warming appears to be related to increases in carbon dioxide and other greenhouse gases. The possibility of adverse consequences has become a major concern for some environmentalists.
Upon the dissolution of the [[USSR]], and when the [[Berlin Wall]] was torn down, leftists sought a new cause. They joined with [[environmentalist]]s to publicize various [[climate change]] issues such as [[ozone depletion]] and the [[runaway greenhouse effect]].
Upon the dissolution of the [[USSR]], and when the [[Berlin Wall]] was torn down, leftists sought a new cause. They joined with [[environmentalist]]s to publicize various [[climate change]] issues such as [[ozone depletion]] and the [[runaway greenhouse effect]].