In Depth

Inside the Paris climate deal

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Science  18 Dec 2015:
Vol. 350, Issue 6267, pp. 1451
DOI: 10.1126/science.350.6267.1451

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The Paris climate meeting left the world with a mixture of hope and uncertainty. The meeting ended with a deal among 195 nations to curb global temperature increases by slowing the rise in greenhouse-gas levels. It broke down the long-standing division between developed countries and developing countries that had stalled previous tries. And it created a timetable for nations to ratchet up their efforts. Yet the individual national climate plans could still result in as much as 3.5 degrees of warming by 2100. Provisions for individual nations to curb emissions further—crucial to limit warming to 2°C or less—have limited legal bite.

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