U.S. and China ratify sweeping climate deal and urge other nations to follow their lead

President Obama and Chinese President Xi Jinping on Saturday formally joined a sweeping global agreement to cut greenhouse gases, moving the world toward a dramatic reduction in climate-warming emissions on a quicker time frame than previously imagined. The ratification of the accord by the world's two biggest polluters, announced shortly after Obama’s arrival here, jump-starts enactment of the landmark deal reached last year in Paris that commits virtually every country to lowering greenhouse gas emissions and slowing irreversible harm to the planet.

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