Make yourself heard

Much has been written on this hot topic. A lot of it is hot air about hot air. Let's examine some proposals from The Atlantic: Judy/August 2009. What you think?

How much of this is science fiction?

Tether zeppelins (traditionally made of metal) at 65,000 feet. Pump 10 KG of sulfur dioxide up to them every second for release.	12.3 miles straight up? How large would such a zeppelin have to be? Of what materials could it be made? Winds aloft & diurnal heating/cooling uncontrollable. What happens to pipe and zeppelin during heavy weather? Not possible by any conceivable technology. THUMBS DOWN on Zeppelin! Better to use commercial airliners for seeding at half the height. What of the basic idea? Sulfur dioxide produces acid rain. An ecological hit is unavoidable. THUMBS DOWN here too
Sea-going ships spew water spray to increase cloud cover.	More practical than the above. At saturation, no direct sunlight reaches earth, reduces solar energy conversion on ground by other means. Would affect food production not to mention other imbalances. RESEARCH NEEDED.
Build a space visor.	Even the author says it is impractical. Blocking the sun does nothing to prevent Carbon dioxide build-up. What about space debris? THUMBS DOWN on visor. Nevertheless, this is the kind of creative thinking that is needed. THUMBS UP for that!
Increase top soil to trap carbon dioxide.	Top soil is a fragile thing and is disappearing fast--thanks to the plow and forest clearing. Even just stopping all runoff silt is clearly not possible at this time. But topsoil does need to be replenished. RESEARCH NEEDED.