Just another brainstormy (i.e. no idea whether it's any good) idea: in
the long run, what takes CO2 out of the atmosphere is weathering of
silicate rock to produce carbonate that winds up in sediment. I think
that in many areas the soil and subsoil (where groundwater percolates)
are fairly completely weathered. Could we speed up removal of CO2
from the atmosphere by creating cracks in bedrock for water to
percolate through, by altering topography to make water flow into and
out of the ground, by changing the patterns of use of aquifer water
and surface water, or by using aquifer recharge as a means of storing
water for municipal use?
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