It’s thirty years from now. We’re making progress, mitigating climate change, slowly but surely. But what about all the angry old people who can’t let go?For young Americans a generation from now, climate change isn't controversial. It's just an overwhelming fact of life. And so are the great efforts to contain and mitigate it. Entire cities are being moved inland from the rising seas. Vast clean-energy projects are springing up everywhere. Disaster relief, the mitigation of