To be quite honest I find it rather strange that so many people on this forum, weather enthusiasts and people who obviously know about this more than general public, deny global warming and its consequences, despite the fact we are no longer talking about probablities like "very likely" but rather "certain" (I am basing this on the last IPCC report which I was translating to Czech so I read it in quite some detail).
Having studied biology and genetics in particular, I would compare this to denying evolution, which is also something lot of people still do.
I am a very rational person and studied natural sciences and to me, the answers to the above questions are quite obvious based on not just the information I learned, but also what I see and millions of evidences.
Likewise though, I am very tolerant in terms of respecting other people´s believes so I have no problem with other people having a different opinion, as long as they do not try to prove me wrong