>Cutting back on CO2 emissions would clearly work, but it’s expensive and painful. This is so painfully backwards. "Saving the Planet" doesn't mean spending tons of money and doing tons of work, quite the opposite. The absolute best thing for the Planet would be for every human being to do nothing at all. Stop driving, stop working, stop eating entirely, and then things will quickly recover. Obviously that's a bit ex…
But I don't care: I'm a human and I love other humans and I want humans to prosper as much as possible. Which requires activity which contributes to our shared prosperity. Ideally that prosperity would also include a nice planet to live on though. Earth is a reasonable choice.