2) Global warming is a real problem. In this case, those individuals who are really looking out for themselves would give a shit about it because it's going to hurt them.
But those who don't give a shit would really make it worse for everyone, regardless of the fact that there are those who do give a shit.
Sure, in a Democracy that's exactly what happens. Those who don't give a shit simply get the government to set pollution limits that allow them to pollute as much as they want and pre-empt any nuisance lawsuits. But that tool wouldn't be available to them in a Libertarian society.