The point is that while tackling climate change in the way envisaged by the Paris accord used to look like a hard engineering and economic problem, these days it looks fairly easy. We have almost all the technology we need, and can be quite confident of developing the rest. Obviously the transition to a low-emissions economy, the phasing out of fossil fuels, would take time, but that would be O.K. as long as the path was clear.

Why, then, are so many people on the right determined to block climate action, and even trying to sabotage the progress we’ve been making on new energy sources?

Don’t tell me that they’re honestly worried about the inherent uncertainty of climate projections. All long-term policy choices must be made in the face of an uncertain future (duh); there’s as much scientific consensus here as you’re ever likely to see on any issue. And in this case, uncertainty arguably strengthens the case for action, because the costs of getting it wrong are asymmetric: Do too much, and we’ve wasted some money; do too little, and we’ve doomed civilization.

Don’t tell me that it’s about coal miners. Anyone who really cared about those miners would be crusading to protect their health, disability and pension benefits, and trying to provide alternative employment opportunities — not pretending that environmental irresponsibility will somehow bring back jobs lost to strip mining and mountaintop removal.

While it isn’t about coal jobs, right-wing anti-environmentalism is in part about protecting the profits of the coal industry, which in 2016 gave 97 percent of its political contributions to Republicans.

As I said, however, these days the fight against climate action is largely driven by sheer spite.

Pay any attention to modern right-wing discourse — including op-ed articles by top Trump officials — and you find deep hostility to any notion that some problems require collective action beyond shooting people and blowing things up.

Beyond this, much of today’s right seems driven above all by animus toward liberals rather than specific issues. If liberals are for it, they’re against it. If liberals hate it, it’s good. Add to this the anti-intellectualism of the G.O.P. base, for whom scientific consensus on an issue is a minus, not a plus, with extra bonus points for undermining anything associated with President Barack Obama.

And if all this sounds too petty and vindictive to be the basis for momentous policy decisions, consider the character of the man in the White House. Need I say more?