Several companies have created products based on carbon-negative technologies, but doubts remain over their large-scale use
It is a device invented by All Power Labs, a Berkeley-based startup, that can produce gas from biomass and generates charcoal which can be used as a fertiliser. The invention is based on an over 100-yearold technology called gasification. It uses biomass such as wood chips, almond shells and corn husks to produce clean fuel. Over 500 such devices have been sold to customers who are mostly from the developing world.
It is a carbon-negative cement created by a London-based company which goes by the same name. Normally, cement is produced by heating limestone at high temperatures. The process emits huge amounts of carbon. But Novacem uses magnesium silicates instead of limestone. Carbonates made from carbon dioxide and other minerals are then added to the cement, making it carbon-negative. The cement, however, is not commercially available on large scale.
It is a type of plastic made by sequestering carbon emissions that would otherwise become part of the air. It is a trademarked product made by Newlight Technologies. Plastic is normally produced using oil and other fossil fuels. In Air Carbon, carbon emissions are captured from sources such as landfills and power plants and fed into reactors where enzymes react with the gases to produce the plastic. However, experts have raised doubts about the technology being carbon-negative because fossil fuels are burnt during the manufacture of the plastic.