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cycles of warming and cooling have occurred every 1,500 years.
'''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.
'''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>
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]].