The hydrogen is combined with atmospheric nitrogen to produce ammonia. Usually we source it from natural gas, so all our fertilizer is incredibly carbon intensi

The hydrogen is combined with atmospheric nitrogen to produce ammonia. Usually we source it from natural gas, so all our fertilizer is incredibly carbon intensive to make whereas this would at least be carbon neutral. At the end, you'd just oxidize the CO back to CO2 before release, like a catalytic converter does, or use the CO as a chemical building block to produce hydrocarbons.