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There's one issue that will define the contours of this century more dramatically than any other, and that is the urgent and growing threat of a changing climate.

Barack Obama
Issues, Climate, Growing
Remarks by the President at U.N. Climate Change Summit, obamawhitehouse.archives.gov. September 23, 2014.
There's one issue that will define the contours of this century more dramatically than any other, and that is the urgent and growing threat of a changing climate.