• 261 Videos, Slides, Films

• 76 Conservation of natural resources
• 73 Natural resources
• 71 Water
• 65 Land use
• 63 Human geography
• 61 Environmental protection
• 58 Management
• 57 Economic aspects
• 57 Human ecology
• 54 Effect of human beings on
• 54 Nature
• 54 Power resources
• 46 Energy consumption
• 46 Energy development
• 46 Environmental geography
• 36 Pollution
• 28 Social ecology
• 27 Study and teaching
• 24 Environmental sciences
• 23 Social change
• 21 Physical geography
• 20 Economic geography
• 20 Refuse and refuse disposal
• 20 Toxicology

• 198 Films Media Group
• 169 Films for the Humanities & Sciences (Firm)
• 34 Alexander Street Press
• 13 Annenberg Learner (Firm)
• 12 Green Planet Films
• 9 Docuseek2 (Firm)
• 9 Public Broadcasting Service (U.S.)
• 8 Network Ireland Television
• 8 Television Trust for the Environment
• 8 Wild Hare Productions LLC
• 7 Canadian Broadcasting Corporation
• 7 Infobase
• 7 Parthenon Entertainment (Firm)
• 7 System TV (Firm)
• 7 Video Education Australasia
• 6 Agency for Instructional Technology
• 6 Deutsche Welle
• 6 National Geographic Television & Film
• 5 Bullfrog Films
• 5 Cambridge Educational (Firm)
• 5 Journeyman Pictures (Firm)
• 5 MATERIALS FOR HUMANITY (MH 21) (2021)
• 5 New Atlantis (Firm)
• 4 TOUR 2021 (2021)
• 3 4 Learning (Firm)

• 259 English
• 8 Multiple languages
• 3 Hindi
• 2 Spanish
• 1 French
• 1 German
• 1 Hausa
• 1 Japanese
• 1 Lao
• 1 Niger-Kordofanian (Other)
• 1 Tamashek
• 1 Undetermined
• 1 Urdu

• 20 Earth (Planet)
• 14 United States
• 8 Africa, Sub-Saharan
• 7 California
• 7 India
• 6 South Asia
• 5 Australia
• 5 Canada
• 5 China
• 4 Latin America
• 4 Oceania
• 4 South America
• 3 Asia
• 3 Bangladesh
• 3 Idaho
• 3 Los Angeles
• 3 Middle East
• 3 Southeast Asia
• 2 Africa
• 2 Alaska
• 2 Alberta
• 2 Ballona Wetlands
• 2 Ballona Wetlands (Calif.)
• 2 Central America
• 2 Europe

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