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The Paris Climate Deal Can't Succeed Without Cities

Local leaders will guide policy change until the international agreement goes into effect in 2020.
Activists gather in Paris on December 12, 2015, during the COP21 climate talks.
Activists gather in Paris on December 12, 2015, during the COP21 climate talks.AP Photo/Thibault Camus

The 21st time was the charm.

After two decades of trying, the UN’s climate change institution locked down international consensus from rich and poor nations alike to fundamentally change the ways humans power their activities. Almost 200 countries committed to voluntary greenhouse gas reduction targets and pledged to revisit them at regular intervals to limit global warming to “well below” 2 degrees Celsius. It’s a deal that knows it isn’t perfect, and takes steps to get better with time. And just a few years ago, it was wholly unthinkable.