Speaking in Paris where more than 150 world leaders have gathered for a UN summit aimed at reaching an agreement to curb global warming, Obama said a growing threat of climate change could define the contours of this century more dramatically than any other.
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"As the leader of the world's largest economy and the second largest emitter... the United States of America not only recognises our role in creating this problem, we embrace our responsibility to do something about it," Obama said.
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