President Obama met with China's president, Xi Jinping, at an event linked to the international climate conference held late last year outside Paris. Evan Vucci/AP hide caption

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Can The U.S. And China Keep Their Climate Pledges?

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A power-generating windmill turbine is seen in front of the Arc de Triomphe on the Champs Elysees avenue in Paris ahead of the COP21 World Climate Summit, which begins Monday. Christian Hartmann/Reuters /Landov hide caption

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Floodwaters from rising sea levels have submerged and killed trees in Bedono village in Demak, Central Java, Indonesia. As oceans warm, they expand and erode the shore. Residents of Java's coastal villages have been hit hard by rising sea levels in recent years. Ulet Ifansasti/Getty Images hide caption

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Science Confirms 2014 Was Hottest Yet Recorded, On Land And Sea

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President Obama, seen here inspecting solar panels on the roof of the Department of Energy, has submitted a U.S. pledge to reduce greenhouse gases. Kevin Lamarque/Reuters/Landov hide caption

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Scientists Track Down Serious Methane Leaks In Natural Gas Wells

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Country representatives listen to opening remarks at the start of the United Nations' Conference of the Parties on Climate Change in Lima, Peru. Cris Bouroncle/AFP/Getty Images hide caption

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World Climate Talks In Lima Aim To Move Beyond Kyoto Treaty

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