Isn't George Carlin the guy that said "the planet is doing fine, the people are fucked"
The joke was able how "saving the planet" was self-aggrandizing bullshit from people who are obviously more concerned about saving themselves or saving humanity rather than saving the planet. If there was a choice between saving humanity or saving the planet minus humans, of course most people would elect to save humanity over the planet. To think otherwise just makes you some ecofascist.