Keith believes that the world will eventually cut its carbon emissions if not all the way down to zero, then close to it. He also believes carbon-removal technologies can eventually be scaled up to take care of the rest. But all this—quite possibly—will not be enough. During the period of “overshoot,” a great many people will suffer and changes that are, for all intents and purposes, irreversible may occur, like the demise of the Great Barrier Reef. The best way forward, he argues, is to do everything: cut emissions, work on carbon removal, and look a lot more seriously at geoengineering.
