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What makes scientists think that humans are causing global warming now?
by Franco on 1/2/2009, Posted in Environment » Global Warming
If Earth has warmed and cooled throughout history, what makes scientists think that humans are causing global warming now?


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■ By Peter on 1/2/2009
The main reason that scientists think humans caused warming since 1950 is that none of the natural processes that influence Earth’s climate have changed enough during that time period to explain the warming.
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