This is an extremely simplistic, if not outright naive take. Majority might be for “combatting climate change”, sure, but when it comes to actual methods to do that, you’ll find that there is hardly a broad agreement as to what exactly should be done about it.

For example, I support carbon tax, but I’m against directly subsidizing solar/wind energy projects (as we do now). You’ll also find plenty of people who support both of these measures, and those who support only subsidies, but not direct carbon tax. What to do about it?

The current approach seems to be that the Congress, instead of talking it among themselves, making deals and reaching majority to pass a bill, just delegates the job away to bureaucrats in federal agency. As a result, in so many aspects of life, we are being ruled by unelected, unaccountable, nameless bureaucrats, who proclaim “rules” that no majority would ever support. What’s the point of democracy again?

There is, of course, another solution to this, that works much better in practice: getting federal government out of all of this, and leave these things to states, exactly as the authors of the system intended. You’ll observe that the states have much less troubles passing bills about protecting or prohibiting abortion, for example. Why must everything be ruled by federal government, which was never intended to be doing that?