- ibis
- 2-41 2-42 2-61 2-86 2-102 2-104 17-62
- IBM
- 2-215
- Imperial Chemical Industries (ICI)
- 2-37 2-38 2-39 2-40 2-42 2-43 2-44 2-45 2-46 2-47 2-49 2-50 2-51 2-53 2-54 2-55 2-57 2-60 2-62 2-63 2-64 2-66 2-67 2-70 2-71 2-74 2-80 2-81 2-82 2-83 2-88 2-90 2-92 2-93 2-95 2-96 2-98 2-105 2-114 2-120 2-122 2-127 2-129 2-131 2-132 2-148 2-149 2-151 2-152 2-153 2-154 2-158 2-168 2-172 2-174 2-175 2-191 2-197 2-198 2-209 2-210 2-211 2-212 3-1 8-4 8-8 8-9 8-17 8-35 11-1 11-6 11-7 11-8 11-10 11-12 11-14 11-19 11-23 11-25 11-26 11-27 11-34 12-10 12-16 12-17 12-19 12-20 12-24 12-25 12-26 12-29 12-31 12-32 12-33 12-34 12-35 12-37 14-8 14-9 14-10 14-11 14-12 14-13 14-14
- Imperial Valley, California, USA
- 17-11
- India
- 2-71 8-21 10-1 10-4 17-15 17-16 17-17 17-36 17-39
- indigenous people
- 2-188 2-202
- Indo-China
- 2-92
- industrialisation
- 2-53
- Ingpen, R. R.
- 14-4 14-7 16-1 16-2 16-3 16-4
- Ingpen, Robert and Rupert
- 14-4
- inland fisheries
- 11-5 11-10
- insecticides
- 2-53 2-57 2-90 8-35
- Institute for Public Affairs
- 8-5
- Institute of Engineers
- 11-32 11-34
- Institute of Food Technologists
- 11-19
- Institute of Foresters
- 11-2
- Institute of Marine Science, Townsville
- 2-72
- Institute of Municipal Administration, Victoria
- 11-27
- Institution of Engineers
- 8-31 11-9 11-15 11-32 11-33 11-34
- International Planned Parenthood Federation
- 8-4
- International Union for Conservation of Nature and Natural Resources (IUCN)
- 2-47 2-161 2-170 2-173 8-13 8-35 11-12 11-21 11-23 11-31 12-1
- introduced species
- 14-14
- irrigation
- 2-46 2-71
- Italy
- 17-4
- ivory ban
- 2-211
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