| Abbreviation | Definition |
|---|---|
| RETF | Regional Environmental Task Force |
| RETS | Radioactive Effluent Technical Specification |
| RETS | Renewable Energy Tracking System |
| RFBP2 | Rajasthan Biodiversity and Forestry project Phase 2 |
| RFCS | Rain Forest Conservation Society |
| RFDI | Rangeland Fire Danger Index |
| RFI | Radio Frequency Interference |
| RFI | RCRA (Resource Conservation and Recovery Act) Facility Investigation |
| RFMT | Responsible Forest Management and Trade |
| RFW | Red Flag Warning |
| RGMC | Reform Gravel Mining Coalition |
| RHCP | Regional Habitat Conservation Plan |
| RHEC | Roy Hyatt Environmental Center |
| RHEC | Roy Hyatt Environmental Center's |
| RIBD | Recreational Information Database |
| RIEL | Research Institute of Environmental Law |
| RIET | Regional Institute for Environmental Technology |
| RIET | Regional Institute of Environmental Technology |
| RIL | Reduced Impact Logging |
| RIOS | Recycling Industry Operating Standard |