If you have time over the holidays check out this video:
Produced by the BBC, this program gives an excellent historical overview of the terra preta (dark earth) soils in the Amazon and lays out an impressive case for using charcoal (we call it biochar) as a soil amendment to help build and maintain soil health worldwide.
I had only seen a few clips from this film before and it was very informative and inspiring to watch the whole thing. There is another short video at the end discussing biochar’s potential for sequestering carbon safely in soil.
Raymond Baltar