The Azimuth Project
Carbon negative energy (Rev #1)

Carbon negative energy refers to any form of usable energy whose production reduces the amount of carbon dioxide in the Earth’s atmosphere.

Biochar

One source of carbon negative energy is biochar: the creation of gas from wood, leaving behind charcoal which can be buried to sequester carbon.

If you can think of other sources of carbon negative energy, enter information about them here! — John Baez