Environmentalists, all too often, think that the best way to go about solving the problem is to get everyone to do as they…do. I don’t eat meat. I don’t drive. But individual do-gooderism won’t solve global warming. And it may actually be counter-productive, for two reasons. First, there’s a well-documented psychological phenomenon called “single-action bias.” You do one thing, and you move on. You carry your groceries home by foot, in a cotton canvas bag, and you think that single act of environmental kindness makes up for other sins.