There is the need to draw down carbon from the atmosphere if we hope to have livable earth because we’re on a trajectory to see catastrophic levels of warming (3-4˚C) if we do not. This combination taps into one of the cost-effective ways of doing this. Direct industrial /chemical air capture of CO2 is not cost-effective, because the concentration of CO2 in the atmosphere is still too low for such processes to be efficient.
Plants draw down so much carbon from the atmosphere in producing their biomass that their impact on atmospheric CO2 levels is visible as the downward strokes of the Keeling curve. Every year, as the northern hemisphere enters its growing season, CO2 levels worldwide take a downturn.
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