In an interview he did recently (can't find it now), he claimed to be a free market capitalist in response to a question about universal basic income, and said he really doesn't like UBI and would only go that way in extreme circumstances. He showed some awareness and understanding of how markets and human motivation work. He may have been socialist in the past, but he doesn't appear to be socialist today.

As for his environmentalism, he may be wrong, but it's not batshit crazy to behave as if the survival of the human race is at stake when you actually believe it to be true. I find it refreshing for someone to act as if they actually believe their ideals, rather than just virtue signalling to be accepted into their clique of society and never doing anything postiive about the problems they only talk about. Whether he is wrong or not is difficult to judge - I think climate change isn't catastrophic, but a lot of smart people think it is, and I don't have enough knowledge to hold a firm opinion.

I'd rather have somebody like that who is (somewhat) wrong but intellectually honest and could be convinced otherwise, than the normal alternatives.