By converting the carbon in biomass into stable carbon structures in biochar, which can remain stored in soil for hundreds or even thousands of years, sustainable biochar systems can be carbon negative. As a result, there is a net reduction in atmospheric CO2. Producing biochar actually lowers atmospheric CO2 because it converts a naturally occurring organic matter decaying process that would otherwise be carbon-neutral into a carbon-negative process.

In addition, the production of biochar can reduce greenhouse gas emissions associated with the decomposition of organic matter in landfills or the burning of biomass for energy.
Biochar is capable of improving the Soil sustainability when used in lands.
Biochar can also improve soil sustainablity in several ways, such as increasing water-holding capacity, reducing nutrient leaching, promoting soil biodiversity, and increasing crop yields. This can help to increase the resilience of agricultural systems to climate change and improve food security. The beneficial effects of Biochar on soil sustainability is permanent and being high in carbon it prevents carbon dioxide from being released into the atmosphere. One ton of carbon in biochar is equal to three tons of carbon dioxide permanently removed from the atmosphere.
Overall, the application of biochar in environmental sustainability has the potential to contribute to several sustainable development goals, such as reducing greenhouse gas emissions, improving soil health, and increasing food security, but more research and development is still required to fully understand the potential implications and risks associated with the use of biochar.
Like biochar, wood vinegar can also have environmental benefits. It has been shown to improve soil health by increasing the availability of nutrients and promoting the growth of beneficial microorganisms. This can lead to increased crop yields and reduced dependence on chemical fertilizers.