"Terra preta"-Archeologists discover super fertile soil
 

This is a very good article on "Terra Preta" soils " Saving the Soil as
well as the Planet" an amazing article with a lot of implications for
climate control, global warming as well as agriculture and gardening.
http://www.bidstrup.com/carbon.htm

See also the discussion at:
http://forums.hypography.com/earth-s...html#post99956
or google 'Terra praeta' for more info
Michael