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Line 1: − + − − 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>
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[[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 gas]]es. The possibility of adverse consequences has become a major concern for some environmentalists.
'''Global warming''' is the increase of temperature since 1880. This increase in temperture is mainly caused by the increases in [[carbon dioxide]] and other [[greenhouse gas]]es. The possibility of adverse consequences has become a major concern for some environmentalists.
According to some research, 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.
According to some research, 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.
According to geologists, the Earth has experience numerous [[ice age]]s during which the temperature dropped so far that [[glacier]]s could cover [[North America]] and [[Europe]].
According to geologists, the Earth has experience numerous [[ice age]]s during which the temperature dropped so far that [[glacier]]s could cover [[North America]] and [[Europe]].