Since I am nearly always behind technologically, or even on technological information, I didn't realize that a concept I used in a story last year has a name. The story was "The Rules" (ASIMOV'S, December), and it featured a way to lessen global warming by increasing the reflection of sunlight back to space. The name is "geoengineering." What I also didn't realize was the in 2006 a Nobel winner, Paul Crutzen, published an editorial outlining an even more radical way to lessen global warming: release a lot of sulfurous debris into the atmosphere. This would create a haze that would lower global temperatures, much as happens naturally when major volcanic eruptions release vast clouds of sulfurous particles.
Not having read Crutzen's original article, I don't know if he was exploring this idea, suggesting it, or advocating it. It has a lot of science-fictional appeal: it's huge, dangerous, and hubristic ("We are become as gods.") Certainly it would lend itself to SF-story material (which I may or may not use someday). But Dr. Crutzen is not an SF writer. He says more research is needed before any action is taken (well, yes), but when a Nobel Prize winner proposes an idea with any degree of seriousness, people tend to listen.
It would mean high maintenance -- we'd have to keep on dumping in haze to keep the cooling effect. And then we'd get all the other effects, known and unknown, of a hazy, sulfur-filled atmosphere. Plus some pretty spectacular sunsets.
Less seriously, in my small corner of the world, we could use some global warming. It is still snowing in Rochester, New York, and will be all week. Perhaps for the next month. Seemingly forever.