[sleepysysadmin]

>I'm not sure what 'climate [change] denial' means:

I think climate denial is much simply defined than your well laid out levels.

>I'm pretty sure all these opinions are allowed, especially if backed by evidence. Though I would expect A. and to a lesser extent B. to require quite a bit more of a thick skin. There is plenty of readily available data that indicates climate change is already happening.

The thing is, go check out the daily climate change topics and you won't see any of those. Why is that?

AOC says we have about 10 years left until 'world is going to end'

Todays climate post has a DEADline clock of 7 years 281 days. Even sooner!

The reason you're not allowed to be a science denier is because you are literally trying to kill humanity.