The world’s two most powerful countries, the United States and China, are meeting this week in Washington to talk about climate change. And also their relationship issues.

In an ideal world, where the clean energy transition was the top priority, they would be on friendlier terms. Maybe affordable Chinese-made electric vehicles would be widely sold in America, instead of being viewed as an economic threat. Or there would be less need to dig a lithium mine at an environmentally sensitive site in Nevada, because lithium, which is essential for batteries, could be bought worry-free from China, which controls the world’s supply.