> If I invest $100 in protecting a public good (like the climate), I only get one seven-billionth of the benefit; the rest goes to all of the other people on the planet. So I'll only invest if everyone else chips in, too.

I used to think like this, but I'm fed up of taking "economic maxims" that I read on the Internet as being actually true.

I don't believe this to be the case. I think that taking action, being public about taking action, and ultimately standing behind what you think is right, taxes and others be damned, is the way to go.

Yes, there will be free riders. That's inevitable in anything you do. People "free ride" on software I write all the time. I can shoulder it.