world's craziest geoengineering scheme

«A manmade volcano erupting continuously to shade the Earth until greenhouse gas levels in the atmosphere are brought down. Thousands of mirrors boosted into geosynchronous orbit to block sunlight. Crewless ships wander the oceans spewing saltwater into the air to increase cloud cover.

These are just a few of the proposals from scientists to manipulate, or geoengineer, the planet to stave off global warming.»

http://www.scientificamerican.com/podcast/episode.cfm?id=worlds-craziest-geoengineering-sche-09-09-03