Most people who complain about rich environmentalists flying on private planes seem to be on the right. I don't quite get this: you aren't opposed to the existence of millionaires, are you?

You already accept that some people, through their hard work or inheritance or whatever, are entitled to a larger share of material goods. Why shouldn't they also be entitled to a larger share of the total emissions we decide we can handle? As long as they compensate the rest of us for the privilege, maybe - though people on the right tend not to be too excited over severance taxes either.

Assuming they're OK with great material inequality, which sadly they usually are, a rich environmentalist is not especially hypocritical for talking a bigger share of what nature can bear.