I'm not sure if you're being sarcastic or not. Climate change is going to require changes of at least that scale, whether we reduce emissions or not.

Luckily for humanity that won’t actually be necessary.

In the next 20-30 years I suspect we’ll just moderate total solar irradiance as-needed by injecting moon dust into L1.

The only issue is if there are powerful countries that are actually benefiting from the warming and don’t want to cool it down bit.

Luckily for humanity that won’t actually be necessary because in the next 20-30 years we're likely to revert to savagery and barbarism, and "civilized" behaviors won't matter anymore (assuming one of our "leaders" doesn't do the epic stupid and get us all "nuked" out of existence).

I think that's pretty easy if government incentives are in place.

Imagine if they don't.