In addition to its effectiveness in soil amendment biochar is now being considered as a simple low cost tool for mitigating climate change.
The production and usage of biochar in soil creates a carbon negative cycle by transforming the carbon in biomass into stable carbon structures in biochar which can remain sequestered in soils for hundreds and even thousands of years. Under normal conditions biomass would decompose or burn, releasing CO2 but when making biochar almost 50% of the carbon is held in biochar. The result is a net reduction of CO2 in the atmosphere. Carbon in the soil is better
than carbon in the air.
Reduction in GHG emissions
Biochar reduces emissions of 2 potent greenhouse gases, nitrous oxide and methane from agricultural soils. Research indicates that biochar-amended soils can provide anywhere from 50-80% reduction in nitrous oxide emissions, which is significant considering that the nitrous oxide released from certain fertilizers is much more potent than an equal amount of carbon dioxide. Converting agricultural and forestry waste into biochar also reduces methane
generated by natural decomposition.