I like to give the occasional opposition article on some of the alternative future plans because its important to realize the proper strategies must be worked out for lower environment impact. Example Windturbines vs bat, is purely HAWT related or do VAWT systems do the same as well and if so which styles (VAWTS have lots of different styles) ones have the lowest impact.
This article is a hold on a second don't jump the gun just yet warning, we saw what happened to food prices and the resultant shortages when farmers & ethanol. This article is about Biochar
and questions whether or not Terra Preata can be duplicated simply through low temperature charcoal as well as some overreaching claims about trapping carbon dioxide with biochar. In other words it asks was there a secret ingrediant or special mixing formula that we overlooked. I myself remember from some articles there is a microorganism involved in Terra Preata. So it may be that such an organism is entirely necessary and is entirely region dependent in which case it does little good to try to make Terra Praeta outside the Amazon, but weapparently don't know enough about the stuff to know yett according to the article.
Now outside the who weird burn/make charcoal to capture carbon dioxide weirdness, the only things I considered important about Terra Preata was it was good for crops, and if made correctly (that means proper strategies) it could replace some of the topsoil everyone has been losing due to industrial farming. On the personal side I see no reason why one should not add coooled organic charcoal from a family BBQ into the compost heap for ones garden, its matter of giving back to nature whats hers, if it improves ones garden's health so be it. But industrializing the process before proper studies and experimentation has proven valid is jumping the gun IMHO. In other words don't buy 12-30 dollar bags of charcoal for your garden or farm hoping to get Terra Preta until more data comes out.http://www.commondreams.org/view/2010/06/08-1