It would require a very large eruption to make a worthwhile dent in the rate of warming; small-ish ones happen all the time with no strong effect. Even if such

It would require a very large eruption to make a worthwhile dent in the rate of warming; small-ish ones happen all the time with no strong effect. Even if such an eruption didn't have a lot of highly undesirable side effects, we simply don't have any way to trigger something like this. At any rate, the short-term consequences would be absolutely devastating and in no way cheap.