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Re: Terra preta- global Warming- Global cooling.
That's how I see it too.
If the early claims that char holds nitrates in micropores with some combination of mechanical and electrostatic forces, and releases it in response to plant root enzyme exudates, are verified by further research then the scenarios you draw are valid.
Char would not only be a delivery mechanism for nutrients, it would capture and hold those that come from all sources, such as rain or mineralization of organic nitrogen by bacteria. Once added to soil it will permanently change soil characteristics for the better.
Or so it seems. One can hope.
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