| Abbreviation | Definition |
|---|---|
| HWRC | Hampshire Waste Recycling Centres |
| HWRC | Household Waste And Recycling Centre |
| HWRC | Household Waste and Recycling Centres |
| HWRC | Household Waste Recycling Centre |
| HWRC | Household Waste Recycling Centres |
| HWTR | Hazardous Waste and Toxics Reduction |
| I | Alleviating the Global Water Crisis |
| IA | Inflow Area |
| IAA | Impact Assessment Agency |
| IAED | Interior Architecture and Environmental Design |
| IAEG | International Aerospace Environmental Group |
| IAEP | Illinois Association of Environmental Professionals |
| IAEP | International Association of Environmental Philosophy |
| IAES | Institute of Agricultural and Environmental Sciences |
| IAIA | International Association of Impact Assessment |
| IAMFES | International Association of Milk Food and Environmental Sanitarians |
| IBBA | Important Bird and Birding Area |
| IBFM | Integrated Basin Flow Management |
| IBFT | I Brake For Trees |
| IBRCS | Integrated Biohydrogen Reactor Clarifier System |