There is a one-in-300 chance that Earth will be struck on March 16, 2880, by an asteroid large enough to destroy civilization and possibly cause the... →
Nathan Myhrvold
For relatively modest amounts of sulfur dioxide injected into the atmosphere, you could easily cool Earth by 1% or more, if you want.
The prize for ultimate inefficiency goes to America. We have built in so many checks and balances that our 'leaders' are the most thoroughly... →