All_Farked_Up: It's a good idea, just needs to be bigger, like 500 km and up in space.

Drat. I wasn't the first person to think of geo-engineering. You stepped on my line, All Farked Up!

Actually, substitute a balloon wind-mill for banners and you could generate some useful electricity--all clean, all green, except for the cloth, which could be hemp, silk, or green certified cotton, I suppose. I've seen some models on green websites: they're sort of like blimps or zeppelins crossed with a child's pull toy.

multiple popunders make babby Jesus cry

trufax

I'm a liberal card-carrying tree-hugger and that banner has to be the most worthless piece of crap I've ever seen. Unless they can put that thing in orbit to help shade the planet, they might as well use it to make burial shrouds.