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I was gonna say... low cost, I know what is low cost.
In my research, I found that pre-industrial CO2 concentrations were among the lowest the earth has ever experienced (since life existed on it). Photosynthesis stops somewhere around 180 ppm, and we were down to 280. An ideal concentration for plants is somewhere around 800. We're currently at 410.
There should be a positive feedback system to accelerate plant growth since these are "greenhouse" gasses. More greenhouse, more green.
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