"Why is humanity so reluctant to save itself? First, many people simply do not accept the predictions issued by climate scientists. But denialism is the least serious of the three main obstacles." But.... the author mentions climate change denialism but fails to mention climate change skepticism which is an entirely different animal. There are few climate denialists but many climate skeptics. Skeptics agree that there has been some warming but they are not yet convinced it's entirely due to carbon emissions and they don't see an existential threat to the planet- and they aren't ready to commit to spending hundreds of trillions of dollars to fix the "problem". Climate "alarmists" continue to refer to anyone who doesn't agree with them as deplorables- which only drives the skeptics into more resistance and into supporting Donald Trump. The idea that this issue is "settled science" further aggravates skeptics since of course it's not settled science. The climate is extremely complicated. A further issue is the fact that it's easy to conclude that there is a relationship between those pushing for rapid change of our energy systems with far left politics. For those who don't believe this- just look at "a vision for an equitable and just climate future" at https://ajustclimate.org/. Then of course we have Climategate from a decade ago. There are many reasons why those pushing for drastic, revolutionary changes in our civilization are not getting what they want.