http://www.newscientist.com/article/mg20126921.500-one-last-chance-to-sa... Lovelock interview: 550 GT carbon fixed by biosphere; 30 GT per year put into atmosphere by humans. Biochar may save us, but we probably won't do it.
http://en.wikipedia.org/wiki/Biochar Lots and lots of references
http://www.sciencedaily.com/releases/2009/01/090128212809.htm Bury ag waste at sea to sequester carbon
http://www.css.cornell.edu/faculty/lehmann/publications/index.html#PeerPubs Lehmann's papers. There's lots of them, and they are loaded with technical info.
http://www.climatechange.ca.gov/events/2008_conference/presentations/200... Proposed ocean acidity mitigation
