>a giant CO2 sink Just to set the numbers straight: Very clean US city: 10^10 [Kg*CO2/year] Absurdly hefty tree, in his prime: 10^2 [kg*CO2/year] vertic

>a giant CO2 sink Just to set the numbers straight: Very clean US city: 10^10 [Kg*CO2/year] Absurdly hefty tree, in his prime: 10^2 [kg*CO2/year] vertical farm: _____ Such is the impact of the giant sink.