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Taking Earth's Temperature

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Is "Above-Normal" the "New" Normal?
The 2000-2009 decade was the warmest since records began nearly 200 years ago, and it seems that successive years and months have only brought similar rankings. Clearly, our climate is changing from that of the recent past. But if this is true, how unusual are current conditions in the grand scheme of things? What factors, natural or otherwise, are to blame for warming temperatures? And what environmental changes should we be prepared for in the future?

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