It covers the basic carbon cycle, biochar's agricultural use, interaction with nutrients and microbes, reversing fossil fuel use, appropriate sources of renewable biomass.. my sources of information are, basically, this mailing list, and my own experiences making and using biochar.
MAKING BIOCHAR: with Peter Hirst of New England Biochar
Many thanks to George Packard of Parrot Creek Productions, Warner, New Hampshire for some really fine work. This is the short version of greater works in progress. Very well done by George and much appreciated.