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The world is about to go on a carbon diet.That's how much carbon dioxide needs to stay in the ground instead of being spewed into the atmosphere for those reductions to happen, even if you take the easier of two goals mentioned in Saturday's deal.Most likely the best the world can hope for is overshooting that temperature by a few tenths of a degree and then somehow slowly – over decades if not centuries – come back to the target temperature.That's when the world – technology and nature combined – take out more carbon dioxide from the air than humanity puts in.Without any efforts to limit global warming, the world would have warmed by 3.5 degrees Celsius from now by 2100, according to Climate Interactive.And while China is now the No. 1 carbon dioxide polluter with more than a quarter of the world's emissions, carbon dioxide stays in the air for at least a century, so historical emissions are important. Since 1870, the U.S. is responsible for 18 percent of the world's carbon pollution, compared to 13 percent for China.That all sounds good, but the goals the nations have set aren't enough. Countries agreed Saturday to take another look at their goals every five years.
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