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Originally Posted by Turtle
While the 'dark soils' idea has some merit for improving the garden,
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If by improve you ment to say better plant growth and health - yes.
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Originally Posted by Turtle
this idea that it is a means to change climate is without foundation.
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Interesting claim. Yet no one here is claiming 'a means of climate change' but instead is claiming that you can take atmospheric Carbon and place it into the soil for years.
"carbon dating has shown them to date back to between 1780 and 2260 years."Source: Wim Sombroek (pers. comm.); Bechtold, 2001
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Originally Posted by Turtle
Moreover, it didn't keep the Amazonian people who employed it from disappearing. 
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So are you claiming that the terra preta soil somehow failed the people?
By all means, produce that evidence!
Otherwise, the main theories of lying documentation to the sights seen or death via diesease vectors from the old world have nothing to do with your claim of the soil failing the people.