Since Syria and Nicaragua joined the Paris Accord last fall, the United States stands alone as the only country on the planet to reject the pact. President Trump’s withdrawal, after President Obama was fundamental in forming the agreement, means an abandonment of prominent leadership just as the rest of the world’s governments and companies are moving forward to combat climate change. Arguments about who should act, and how, shape international negotiations. Meanwhile, China has already asserted itself as the new leader on clean energy by launching initiatives and announcing global partnerships. Is climate change a geopolitical crisis in the making?