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CO2 can be used in a variety of chemical processes, to boost plant growth in greenhouses, or it could be dumped in abandoned gas fields.
We have huge gas fields in Groningen which are slowly depleting; the reduced pressure is causing earthquakes and landfalls. Pumping excess CO2 into those could stop all that and possibly help extract the last bits of methane, as well as reduce emissions.
Some kinds of fuel and plastics can be made from CO2 if it gets cheap enough.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
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