Global warming
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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.[1]
According to geologists, the Earth has experience numerous ice ages during which the temperature dropped so far that glaciers could cover North America and Europe.
- ↑ Unstoppable Global Warming by Fred Singer