People mostly get offended when you start demonizing them by comparing them to holocaust deniers. The problem I see is that people are more interested in convincing people that climate change will have apocalyptic consequences than they are in discussing solutions to the problem.
I don't nessisarily think we need to do anything. It's like NYC gets flooded, well ok sucks for them, but not exactly a life or death issue for 100's of millions. Perhaps the will build a dike, perhaps they will move, or perhaps someone is going to dredge the oceans making artificial mountains to side step that problem whatever not going to affect me much.
People get really wound up in these ideas, but the existence or non existence of the moon landing has no real impact on me. It's like sure people are dumb, at what point did you assume people where intelegent and rational because that's clearly not the case.
Them talk about effects of CO2. Does it help plants grow or hurt athletic performance.