Most of the environmentalists I hang out with are on board with most of those ideas, myself included. (And also carbon taxation, which incentivizes a bunch of them) Geo-engineering is a tough one, and I think should be viewed as a last resort, once we're already well on our way to decarbonizing, because otherwise it's the equivalent of trying to stop a speeding car by pressing the brakes without taking your foot off the gas. Something like releasing particulates may cool the earth, but is really hard to do reliably and accurately, and if you ever stop, you're in for a large amount of very sudden warming. There's also a moral hazard effect. It's not fixing the problems, it's trying to treat the symptoms.

That said, I wouldn't necessarily be opposed to it, I just want to make sure we're at least also attacking the root causes as hard as we can as well.