1) I agree, but most of the population does not agree and will vote accordingly. This isn't about what's rational - taking a hit to our standard of living to stave off catastrophe is definitely rational. This is about what the masses will support and vote for.

2) Efficiency gains can help, but shaving off some excess here and there will not prevent a climate catastrophe. It will take drastically less fossil fuel use. I don't see that happening unless technology makes renewables cheaper than fossils. It's hard, but it's possible.