• 23 Videos, Slides, Films

• 23 Energy consumption
• 23 Energy development
• 23 Environmental aspects
• 23 Natural resources
• 11 Conservation of natural resources
• 10 Environmental protection
• 6 Government policy
• 6 Study and teaching
• 5 Business ethics
• 5 Economic aspects
• 5 Moral and ethical aspects
• 3 Dynamics
• 3 Effect of human beings on
• 3 Environmental sciences
• 3 Heat
• 3 Heat-engines
• 3 Human ecology
• 3 International economic relations
• 3 Mechanics
• 3 Nature
• 3 Physical geography
• 3 Thermodynamics
• 2 Architecture, Modern

• 23 Films Media Group
• 23 Films for the Humanities & Sciences (Firm)
• 6 Public Broadcasting Service (U.S.)
• 5 Infobase
• 4 Video Education Australasia
• 3 Cambridge Educational (Firm)
• 1 ABC News Productions
• 1 Agency for Instructional Technology
• 1 Alda, Alan, 1936-
• 1 American Public Television
• 1 BBC Worldwide Ltd
• 1 Canadian Broadcasting Corporation
• 1 Ethical Markets Media
• 1 Galloping Pictures
• 1 Journeyman Pictures (Firm)
• 1 National Film Board of Canada
• 1 Zarafa Films

• 23 English

• 2 Earth (Planet)
• 2 Middle East
• 1 Asia
• 1 Brazil
• 1 California
• 1 India
• 1 Pacific Area
• 1 South Asia
• 1 United Arab Emirates

• 23 Educational films
• 23 Internet videos
• 23 Videorecording

Limit year range