The United States is now the only country not on board with the Paris agreement.

Syria, which has been engaged in a bloody civil war for six years and was the world's last holdout, announced it would sign up to the 2015 climate accord, delegates at the United Nations Climate Change Conference in Bonn, Germany, said Tuesday.

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Nicaragua, which initially rejected the agreement because the government thought it didn't go far enough, announced last month that it would join.

We're #1, in this list of 1.