| Abbreviation | Definition |
|---|---|
| CDKN | Climate and Development Knowledge Network |
| CDLAB | Coastal Dune Lakes Advisory Board (Florida; environmental monitoring) |
| CDM | Carbon Depletion Mechanism |
| CDM | Clean Development Mechanism |
| CDPR | California Department of Pesticide Regulation |
| CDR | Carbon Dioxide Removal |
| CDRA | Construction Demolition Recycling Association |
| CDRA | Covered Device Recycling Act |
| CDRP | Construction Demolition Recycling Plan |
| CDT | Contaminated Drain Tank |
| CDWA | Clean Drinking Water for All |
| CEA | California Environmental Associates |
| CEA | Central Environmental Authority |
| CEA | Citizens Environment Assessment |
| CEAC | Campus Environmental Advisory Committee |
| CEAC | Certified Environmental Access Consultant |
| CEAC | The Citizens Environmental Advisory Committee |
| CEAE | Center For Environmental Awareness And Education |
| CEAE | Center Of Environmental Awareness And Education |
| CEAE | Centre For Environmental Awareness And Education |