FSO Chad Houghton takes us back to 2020 when John Kerry, the first Special Presidential Envoy for Climate, brought the US back into the Paris agreement. Quiz: Which is worse, methane or CO2? Also, what argument won people over diplomatically (hint – not the moral or scientific angle)? And how do we work with adversaries like China to cool things down? And why would a petrostate like the UAE host a global climate conference? Join us, and see also this month's Foreign Service Journal for more.