| Abbreviation | Definition |
|---|---|
| ETMA | Environmental Technology and Management Association |
| ETNA | Environmental Technology Network for Asia |
| ETOA | Environmental Threats and Opportunities Assessment |
| ETOP | Environmental Technology Opportunities Portal |
| ETOP | Environmental Threat and Opportunity Profile |
| ETOP | Environmental Threat Opportunity Project |
| ETP | Effluent Treatment Plan |
| ETP | Industrial Exhaust Purification |
| ETPI | Environmental Technology Program for Industries |
| ETPI | Environmental Technology Program for Industry |
| ETR | Environmental Testing and Research |
| ETRA | European Tyre Recycling Association |
| ETRR | Environmental Test Readiness Review |
| ETRS | Environmental Technology Referral Scheme |
| ETS | Emission Trading Scheme |
| ETS | Emissions Trading System |
| ETS | Environmental Tillage Systems |
| ETSP | Environmental Technologies and Sustainable Practices |
| ETTP | Environmental Technical Training Program |
| ETV | Environmental Technology Verification |