Soot comes from sources such as wood - burning stoves, diesel engines, forest fires and open burning of crop waste. (scientificamerican.com)
Some forms of carbon removal are also subject to significant debate, such as whether bioenergy with carbon capture and storage (BECCS)-- which involves burning biomass like crop wastes for energy and capturing and storing the carbon emissions underground in geological formations — can be truly sustainable at a large scale given competing needs for land, among other concerns. (wri.org)
It would be good if FT could be done small scale to use local crop wastes and heat or electricity used nearby. (greencarcongress.com)