Humans cause climate change - u.s. govt report
"For the warming over the last century, there is no convincing alternative explanation supported by the extent of the observational evidence," said the report by a group of more than 50 US government scientists released on Friday.
http://www.theaustralian.com.au/new...t/news-story/83ce68c5ae3e269fb7ee1a9d2f3ba6e3
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Humans cause climate change
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