What's your opinion on global warming and humans' impact on Earth's climate. 2012 was the hottest year ever in the U.S. and was the 9th hottest year globally.
So what do you think about humans and global warming, what should we be doing?
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A team from Harvard University reviewed over 240 scientific studies on global temperatures in the past, and their research indicates that the earth was significantly warmer between the 9th and 14th centuries than it is today.