1) Afforestation and Reforestation: Starting new forests and expanding existing ones.
2) Soil Carbon Sequestration: Removing carbon from atmosphere and storing it in soil.
3) Bioenergy with carbon capture and storage: Extracting bioenergy from biomass and capturing and storing the carbon.
4) Direct air capture: Capturing carbon dioxide and filtering it
- https://www.thestreet.com/video/microsoft-carbon-negative-what-it-means