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- Jaguar C-X75British concept car
- Jaime Duque ParkJaime Duque Park is a family-oriented amusement park located in the Tocancipá municipality
- Jaisalmer Wind ParkWind farm in Rajasthan, India
- James F. PhillipsAmerican environmentalist and schoolteacher
- James NewlandsJames Newlands (28 July 1813 – 15 July 1871) was a Scottish civil engineer who worked in L
- Japan and weapons of mass destructionAspect of Japan's military history
- Jerrabomberra WetlandsNature reserve in Canberra, Australia
- Jersey-Atlantic Wind FarmFarm
- Jevons paradoxEfficiency leads to increased demand
- Jewish terrorismActs of terrorism committed in the name of Judaism
- Jimmy CarterPresident of the United States from 1977 to 1981
- JL-3The JL-3 (Chinese: 巨浪-3; pinyin: Jù Làng Sān; lit. 'Giant Wave 3'; NATO reporting name: CS
- Joan CarlingFilipino environmental activist
- Johnville Bog & Forest ParkThe Johnville Bog & Forest Park (French: Parc écoforestier de Johnville) is a protected ar
- Joint Convention on the Safety of Spent Fuel Management and on the Safety of Radioactive Waste Management1997 international treaty
- Joint Monitoring Programme for Water Supply and SanitationUnited Nations programme