It's much more economical to extract from the ocean, higher concentrations and working from largest sink mitigates a lot of envirodamage of CO2: http://www.dt

It's much more economical to extract from the ocean, higher concentrations and working from largest sink mitigates a lot of envirodamage of CO2: http://www.dtic.mil/cgi-bin/GetTRDoc?doc=GetTRDoc.pdf&AD=ADA539765 http://www.dtic.mil/cgi-bin/GetTRDoc?doc=GetTRDoc.pdf&AD=ADA..., http://en.wikipedia.org/wiki/Carbon-neutral_fuel#Renewable_and_nuclear_energy_costs http://en.wikipedia.org/wiki/Carbon-neutral_fuel#Renewable_a...