hostis humani generis is latin for "enemies of mankind". It is not hyperbole, it is not deflection. The GP is advocating that everyone is compelled to attack or persecute anyone who is "fighting against stopping or reducing global warming".

> the evidence for it now part of everyday life

I know of no evidence of global warming affecting my everyday life, nor anyone I know. I am open-minded, please show me what I should be looking at to see evidence of global warming in my everyday life. I live in Western PA, USA if that helps.

I think it's fine to engage in a healthy debate with skeptics, informed with facts and well supported suppositions as long as you have the bandwidth. I also acknowledge that one does not have to respond to skeptics, as they can waste time and energy. However, convincing the public of major changes of lifestyle and economy should be hard. At some point, you have to address the skeptics that bring up good, well reasoned arguments. Declaring them "enemies of mankind" is not persuasive, nor does it lead to peaceful resolution of important debates.