FILE - In this Jan. 9, 2009 file photo smoke rises from the steel company ThyssenKrupp in Duisburg , western Germany. Levels of carbon dioxide in the atmosphere have steadily increased since the days of the industrial revolution, contributing to the greenhouse effect that is spurring global warming.  (AP Photo/Frank Augstein, file)
Smoke rises from the steel company ThyssenKrupp in Duisburg , western Germany. Levels of carbon dioxide in the atmosphere have steadily increased since the days of the industrial revolution, contributShow more

Warming could threaten half of species in 33 key areas: report




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