The May 10, 2008 issue of Science News has a fascinating article called Down With Carbon, in which they explore some methods of removing carbon dioxide from the atmosphere. Some methods are:

  • Fertilizing the oceans with iron, which causes a plankton bloom, which then sinks to the bottom of the ocean and takes the carbon with it
  • Using zeolites–minerals that trap other substances in their internal structure–to trap the carbon dioxide
  • Sinking liquid carbon dioxide in the ocean
  • Burying trees
  • Trapping carbon dioxide in volcanic rock or saline layers

This links to the article:
Clearing the Air, what science can do to capture carbon dioxide .