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comes and goes in natural cycles of approximately 1,500 years.
[[Image:Rogerrevelle.jpg|thumb|right|200px|[[Roger Revelle]]]]
[[Image:Rogerrevelle.jpg|thumb|right|200px|[[Roger Revelle]]]]
'''Global warming''' is a natural periodic increase in the average temperature of the Earth's atmosphere, and it has always been followed by period of global cooling. 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>
'''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.
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>
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]].