Given that we've already crossed the point-of-no-return, I think some form of geo-engineering is the only way to prevent rising sea-levels, inhabitable conditions and human extinction. But I hope there's a way to do some sort of controlled experimentation first before committing to a "solution" and statements like this aren't very comforting: "Once those aerosols were released, though, we wouldn’t have a straightforward way to recapture them if the plan didn’t work or had unforeseen negative consequences."