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A semantic rise in global warming’s cause

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STOCKHOLM — Scientists can now say with extreme confidence that human activity is the dominant cause of the global warming observed since the 1950s, a new report by an international scientific group said today.

Calling man-made warming “extremely likely,” the Intergovernmental Panel on Climate Change used the strongest words yet on the issue as it adopted its assessment on the state of the climate system.

In its previous assessment, in 2007, the U.N.-sponsored panel said it was “very likely” that…

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