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Global warming and cooling: The natural planetary warming and cooling trends that the Earth has experienced all through its history. We’re in a warming phase now, up 11(degrees)F during the last 12,000 years, but the rate of warming is greatly increasing, probably due to human activity.
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Tom Skilling is chief meteorologist at WGN-TV. His forecasts can be seen Monday through Friday on WGN-TV News at noon and 9 p.m.
WGN-TV meteorologists Steve Kahn, Richard Koeneman and Paul Dailey plus weather producer Bill Snyder contribute to this page.
