From wooden buildings to air filters – how green cities could remove CO2 from the atmosphere
More than a thousand cities around the world now have #NetZero pledges: they want to emit only as much #CO2 into the atmosphere as they can simultaneously recapture.
Technically speaking, urban removals of this most important #GreenhouseGas could add up to one gigatonne (i.e. 1,000 million tonnes) per year by mid-century.
example: (1) adding 4% biochar to cement as a building material in urban construction, or using wood as a building material for nine out of ten new houses; in addition, (2) returning a third of all city lawns to treescapes; (3) mixing biochar into the soil of urban green spaces, street trees and roof gardens at rates ranging from 2.5 to 20%, depending on the soil type; and (4) equipping 15% of all commercial buildings with small air filters that extract CO2-rich indoor air in urban structures.
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