He doesn’t like the plan, but he’s offered it anyway: if we can’t get our act together to prevent global warming, this guy offers a way to induce global cooling–blast a bunch of sulfur into the stratosphere, so that it can reflect sunlight back into space. Yikes. The biggest problem, of course, is that then the entire world will smell like a giant rotten egg. How will we ever be able to have aliens over for dinner? The shame of it all.