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We must do this and more.

Do not let perfect be the enemy of the future of this earth.

How, given arguments in GP, does this actually do anything of value? Note that I do not consider signaling how much we care as valuable.

Given we can't actually leave the accord until 2020, Trump's whole speech is nothing but signaling.

This was not a treaty ratified by the senate so it's not legally binding in any way.

So then, "leaving" it nothing but signaling.