Well thanks for the comments but it is so obvious that neither of the two commenters have even bothered to look up either Terra Preta or Biochar on the internet. Try Google and read what the rest of the world think about it. There are at least two universities researching it in this country - Swansea and Exeter. It is not just the benefits to horticulture and agriculture, it is also believed to reduce the carbon dioxide in the world to a negative. Naturally our Government are not taking any notice of it. None of governments have ever taken any notice, or encouraged any developments which could be promising to out country. Perhaps no one has offered them any way in which they could line their pockets.