Hmm, let me take a stab at your points
1) No other apex predator exists and thrives in as many varied Eco systems as humans. From the arctic to the desert we adapt and survive. Where as other apex predators fail to adapt and go extinct, we as a species adapt and survive. The reason for this is our ability to reason and to build tools.
2) True, however our ability to reason and build tools allows us to adapt both our selves and the land at a much faster rate than nature. Thus as the land becomes arable we move in and hasten it's conversion.
3) Governments change, people change them. This has been going on for 8000+ years. Nothing new here.
4) Even at current climate change prediction we have a couple of hundred years for the changes to take effect. Think of where we were 200 years ago compared to today. In another 200 years there is no telling the things we could discover, build, or learn. Technology moves faster than climate change no matter how you look at it. You may also note that the population growth of the planet has been slowing and is (from memory) dropped to 2.6 kids per family down from 5 kids per family just 50 years ago. At 2 kids per family there is 0 population growth!