| Abbreviation | Definition |
|---|---|
| HAEE | Hungarian Association of Environmental Enterprises |
| HAMETS | High Altitude Mountain Environmental Training Strategy |
| HAP | Hazardous Air Pollutant |
| HAVC | Headwaters Action Video Collective |
| HAZID | Hazard Identification |
| HAZMAT | HAZardous MATerial |
| HB | Healthy Building |
| HBW | Handbook of the Birds of the World |
| HCA | Hamilton Conservation Authority [Ontario, Canada] |
| HDC | Hudson- Delaware Chapter of the Society of Environmental Toxicology and Chemistry |
| HDC-SETAC | Hudson- Delaware Chapter of the Society of Environmental Toxicology and Chemistry |
| HDES | Human Dimensions of Environmental Systems |
| HE&FS | Hazard Evaluation and Field Studies |
| HEA | Health and Environmental Assessment |
| HEAD | Hydrology Ecology And Disturbance |
| HEAL | Helping Environmental Actions And Learning |
| HEC | Harvard Environmental Chamber |
| HEC | Hybrid Electric Car |
| HECE | Hydraulics in environmental and civil |
| HEEP | Harvard Environmental Economics Program |