The challenge for US defiance of Trump's exit from Paris climate deal

Despite the statements of support for the Paris accord on combating climate change by US cities, states and other groups since President Donald Trump's withdrawal from the agreement concluded in December 2015, they could encounter difficulties in implementing the accord on a sub-national basis.

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President Trump’s withdrawal from the Paris climate agreement led many cities and US organizations to pledge their own actions on climate change. But can cities and groups implement international law when the executive remains unsupportive, asks The Washington Post.