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-science/3451-terra-preta-2.html#post99956
or google 'Terra praeta' for more info
Michael
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