Carbon sequestration: “Diamond has a density of 3.5 gm/m or 3,500 kg/m3. If the wall is 1000km long by 50m high by 10m wide it will consume about 1.75*10^12 kg of carbon”

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Link. Current CO2 output is 4*10^13kg/year. Maybe we could build Mount Diamond and give Minnesota some serious terrain.