I'm not advocating we do that much, just that we use it for the amount of emissions that's less practical to avoid. There's enough basalt for a very large amoun

I'm not advocating we do that much, just that we use it for the amount of emissions that's less practical to avoid. There's enough basalt for a very large amount, and energy to pump gas underground wouldn't be a major factor. Another option though is to turn the CO2 into liquid fuels. That wouldn't reduce ambient CO2 but to whatever extent we keep using liquid fuels (e.g. for airliners), it'd be nice if they were carbon neutral.