What if US quits climate deal? Doesn't look good for Earth

Earth is likely to reach more dangerous levels of warming even sooner if the U.S. retreats from its pledge to cut carbon dioxide pollution, scientists said. That's because America contributes so much to rising temperatures.

Megacities key to reaching global climate goals

The world's big cities must collectively cut their carbon footprint nearly in half within a decade if global climate goals are to be met, according to an analysis unveiled Thursday.

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