See esp. section "9. CO2 Extraction: Plausibility and Cost"!
Congratulations to Adam Sacks, Jim Laurie, and others who have kept educating Jim Hansen about the potential of better agricultural soil management, ecosystem restoration, biochar, and other practices to draw CO2 out of the atmosphere and put it back in the soil.
-- Philip
Philip Bogdonoff
Director, Washington DC Chapter
Biodiversity for a Livable Climate
philip.b...@bio4climate.org
C: 301-356-5132