Indeed - it goes against everything we know about human nature. Have humans ever spontaneously and independently changed their own behavior, at their own incon

Indeed - it goes against everything we know about human nature. Have humans ever spontaneously and independently changed their own behavior, at their own inconvenience, en masse? No - not without strong economic, social, or legal incentives to do so. The gains we make in these areas are pretty much all going to be technological, not behavioral. As you point out the technologies are going to need to minimize the cost and inconvenience to human activity. The day it becomes economically irrational to not use renewable energy is the day that we beat climate change.