| Abbreviation | Definition |
|---|---|
| BUC | Biosolids Utilization Committee |
| BUDM | Beneficial Use of Dredged Material |
| BUGS | Biodiversity Understanding Global Systems |
| BUND | Bund fur Umwelt und Naturschutz Deutschland |
| BUT | to Be Under Threat |
| BVIEER | Bharati Vidyapeeth Institute for Environmental Education and Research |
| BVIEER | Bharati Vidyapeeth Institute of Environmental Education and Research |
| BVR | Brazos Valley Recycling |
| BW | Buried Waters |
| BWCAW | Boundary Water Canoe Area Wilderness |
| BWI | Building and Wood Workers' International |
| BYEE | Bayer Young Environmental Envoy |
| C | Chicken |
| C.L.E.A.N. | Closed Loop Environmental Alliance Network Inc. |
| C/N | Carbon to Nitrogen ratio |
| C3E | Center of Excellence in Energy Efficiency |
| C3E | Clean Energy Education Empowerment |
| C3E | Clean Energy Education & Empowerment |
| CAAA | Clean Air Act Amendments of 1990 |
| CAAC | Compliance Assistance Advisory Committee |