It wasn't those people that pulled the US out of the Paris agreement. All they have done is complain whilst it's been the conservatives that have their hand on the tiller.
I would argue that at least in terms of the environment that wasn't a particulary 'conservative' act, wouldn't you?
It's possible for both sides to be wrong. But when people like John McDonnell - ex-Labour Shadow Chancellor in case you are not familiar with British politics, and the flavour of politician that's prone to quoting Mao in parliament - start talking about the climate emergency you know it's been hijacked.
Oh no, the conservative thing to do would be to conserve your environment and resources. That thinking isn't very Conservative though.
As an aside I never believed Labour would really tackle climate change, they are too in-hoc to the unions whose members often work in industries with high emissions.