To save the world from the worst ravages of climate change, slashing carbon pollution is no longer enough — carbon dioxide will also need to be sucked out of the atmosphere and buried, a landmark U.N. report is expected to say on Monday.

If humanity had started to curb greenhouse gas emissions 20 years ago, an annual decrease of 2% out to 2030 would have put us on the right path. Challenging, but doable.

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