direct air capture

There have been various carbon capture schemes proposed.  In DAC (direct air capture) the air is sucked into a system which filters out carbon dioxide which is then stored, usually in deep geological formations, or else reused in other processes.  This process is enormously expensive, the carbon dioxide being so diluted in the atmosphere that it requires enormous amounts of energy  and some ingenuity to remove it.  There are two facilities for doing this in Iceland which get their energy from a geothermal power plant.  This clean energy source reduces the carbon emissions that might otherwise have been produced. But the amount of carbon removed is so far negligible. However, the plan is to scale up.