| Abbreviation | Definition |
|---|---|
| MERN | Mining and Environment Research Network |
| MERP | Medical Equipment Recycling Program |
| MERTS | Marine and Environmental Research and Training Station |
| MES | Maryland Environmental Service |
| MES | Master of Environmental Studies |
| MESG | Monitoring and Evaluation Steering Group |
| MESL | Marine Environmental Studies Laboratory |
| MESL | Moore Environmental Systems Limited |
| MESL | Moore Environmental Systems Limited's |
| MESL | Multimedia Environmental Simulations Laboratory |
| MESM | Masters of Environmental Science and Management |
| MESME | Making Environmental Stewardship More Effective |
| MESS | Multivariate Environmental Similarity Surfaces |
| MET | Maximal Environmental Temperature |
| MET | Mobile Environmental Team |
| METAP | Mediterranean Environmental Technical Assistance Programme |
| METC | Montana Environmental Training Center |
| METI | Maritime Environmental Training Institute |
| METS | Mini-Effluent Treatment System |
| MEVEF | Massachusetts Environmental Voters Education Fund |