I think structurally it should have been third. As it's currently structured there are three objections. 1. We couldn't do it. 2. It would have disastro

I think structurally it should have been third. As it's currently structured there are three objections. 1. We couldn't do it. 2. It would have disastrous side effects. 3. It wouldn't fix the problem you're trying to solve, and it would in fact make it worse. Objections 2&3 should be swapped, "all life on Earth would be vaporized" should really be issue #3.