Encyclopedias, Almanacs, Transcripts, and Maps
- intelligence service
- Intergenerational Justice
- Interlacustrine Bantu Religions
- Internalizing Costs
- International Cleaner Production Cooperative
- International Convention for the Regulation of Whaling (1946)
- International Geosphere-Biosphere Programme (U.N. Environmental Programme)
- International Institute for Sustainable Development
- International Joint Commission
- International Primate Protection League
- International Register of Potentially Toxic Chemicals (U. N. Environment Programme)
- International Society for Environmental Ethics
- International Trade in Toxic Waste
- International Voluntary Standards
- International Water Laws and Enforcement
- International Wildlife Coalition
- interplanetary matter
- Inti
- intravenous drip
- Introduced Species