After thirty years of ignoring warnings about climate change—we have a few scant years to slash emissions, and also to prepare ourselves and our societies for coping with the fact that we’ve already done irreversible damage. If a soft landing is still possible, it will require slowing emissions way down fast, and also a runway with as few potholes as possible: and in turn that will require a mix of science, politics, economics, and movement-building. Salvation, such as it is, lies in solidarity: in working together to meet the most dangerous, and most interesting, challenge of our lifetimes.