Some are considering releasing dust particles in the air to reflect some of the sunlight, as an alternative to positioning mirrors in orbit above Earth. [There are] a few problems with the dust-particles approach, such as difficulties in regulating the right amount of dust. It may turn out that - in hindsight - too many dust-particles have been released in the atmosphere and that it will be quite a problem getting them out again. Another problem is that the dust-particles method will affect the climate everywhere on Earth.
Sam Carana
- May 20 2005
One such proposal is by Paul Crutzen, who won the Nobel Prize for chemistry when he discovered the causes of the hole in the ozone layer. Paul proposes to shoot hundreds of rockets loaded with tons of sulphur into the stratosphere to create a vast, but very thin sunscreen of sulphur around the earth.
The proposal was discussed in the BBC documentary:
