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The machines at Orca are just one way to remove CO2 from the air. Other methods involve capturing the gas at source — like the chimney of a cement factory — or removing it from the fuel before combustion. That involves exposing the fuel, such as coal or natural gas, to oxygen or steam under high temperature and pressure to convert it into a mixture of hydrogen and CO2. The hydrogen is then separated and can be burned with much lower carbon emissions.
which is exactly how we used to make town gas 150 years ago.