The machines must result in more capture & storage than they produce - net negative emissions. For example, using a machine to heat waste biomass with fast pyr

The machines must result in more capture & storage than they produce - net negative emissions. For example, using a machine to heat waste biomass with fast pyrolysis turns the biomass into bio-oil. Bio-oil can then be pumped underground resulting in long-term, stable storage. The machine produced far fewer emissions than were captured naturally by the plants.