“It’s the easiest thing in the world for me to stand up and say we’re going decarbonize in 2050. How are you going to do that? We’re not really having that conversation yet on climate. What I hope will happen on CNN ... is (for moderators to ask), ‘which sectors are you going to decarbonize first? How are you going to prioritize this among the other thing you’re doing? Which parts of the economy are really hard or even impossible to decarbonize and how are you dealing with that?’”