re: 4) The climate models are unreliable
I would think that if the climate change was due to the "greenhouse" gasses then the global changes would indicate a rise in the low end of the scale as well as the high end, from my casual observations I get the impression that the lows temps. are getting lower and the highs temps. are getting higher, not only that but the time that it takes to go from low to high or vice versa is getting shorter.