This is a cool article on how we can cool the planet by building cloud whitening towers. These towers will be on ships, which will pump up the sea water and vaporize it. The result will make clouds more whiter, reflecting more of the suns energy rays. This is an interesting hypothesis because usually we try to find ways to reduce the amount of Carbon emissions, but this is a way to reduce the Sun's heat that is being transferring to the planet (http://www.bbc.co.uk/news/science-environment-17400804).