Right. What’s the use of being an environmentalist if you can’t be a hypocrite?
What they really want is for about 90% (or maybe 99%) of the human race to die off. Some of them actually admit this, although they are only rarely caught on the record. Most keep it to themselves.
Isaac Asimov's second I Robot story, The Naked Sun, is about a murder that takes place on Solaria, a beautiful, Earth-like planet that has been colonized by humans. It's population is held at 20,000 people, with (if memory serves) 200 million robots to do all the work.