Energy, Government, and Defense magazines
- Mathematical Modeling and Simulation
- Media Influences: An Inconvenient Truth
- Media Influences: Collapse: How Societies Choose to Fail or Succeed
- Media Influences: False Balance
- Media Influences: Ice Age Predictions
- Media Influences: Live Earth
- Media Influences: The End of Nature
- Media: Environmentally Based News and Entertainment
- Medieval Warm Epoch
- Melting
- Mercury Reduction Act of 2003
- Migratory Species
- Milankovitch Cycles
- Millennial Climate Oscillations
- Mining and Quarrying Impacts
- Mitigation Strategies
- Mt. Williamson, The Sierra Nevada, from Manzanar, California
- My First Summer in the Sierra
- Nation Set to Observe Earth Day
- National Park Service Organic Act