"To fix these problems with DIY biochar, we have two options: 1. Make certain that any gases we create (i.e., “smoke” or “fumes”) are burned or flared, thus breaking-down the methane to both CO and CO2 (which are less potent GHGs than methane). 2. Even better, we should engineer systems to make use of these gases for thermal energy. Or some other useful way of displacing fossil fuels. Think biochar cook stoves, greenhouse heaters, etc. Waste-not-want-not!"