Environmental Studies
- Oyashio Current
- Pacific Coast forest
- Pacific North American floral region
- paedomorphosis
- Palaearctic faunal region
- palaeo-
- Paleobotany
- Paleocene
- Paleoclimatology
- Paleocurrent analysis
- Paleogene
- Paleogeography
- Paleolatitude
- Paleotethys
- Paleotropical floral kingdom
- Paleozoic
- Palouse prairie
- palsa
- palsa bog
- Pampas floral region