End-use monitoring and verification is required to demonstrate approved soil or non-soil uses. In practice this means that projects have to demonstrate where the biochar was applied into soils or which product (e.g., cement, building materials) it was mixed into. Once these approved end uses occur, it is virtually impossible to extract the biochar and burn it for energy. It is plausible that a warehouse fire could result in biochar combustion but since an approved end use could not yet be demonstrated, it would be impossible to achieve verification. Furthermore, risk of unintentional combustion (e.g., forest fire, grass fire) is mitigated by requiring that biochar is incorporated to a minimum 10-cm soil depth where risk of combustion of organic material is greatly diminished, and by requiring that biochar is mixed with other less flammable materials like clay or other minerals if it is surface-applied.