@Recovering - I don't think Simon or anyone else on this thread is denying scientific evidence of pollution. Just read his last post carefully - he says reducing Carbon emissions is an important thing.
I think I can identify three main issues with Greta Thunberg and her backers:
1. People generally don't like being lambasted by a 16 year old kid.
2. People are maybe wary about the politics of Thunberg's backers. From where I'm standing, it looks like Greta Thunberg and her backers are radical Left, Marxist or Cultural Marxist types. I'm very happy for people to prove me wrong.
3. People are wary of this narrative that Thunberg is trying to spin, e.g. 'you stole my childhood!' <--- it doesn't pass the sniff test for a lot of people.