• 12 Videos, Slides, Films

• 11 Conservation of natural resources
• 8 Climatic changes
• 2 Renewable energy sources
• 1 Agriculture
• 1 Goodall, Jane, 1934-
• 1 Transportation
• 1 World Wide Fund for Nature

• 12 Alexander Street Press
• 12 Nicholas, Damian
• 12 Thompson, Andrew
• 5 Switch International

• 12 English

• 1 Great Barrier Reef (Qld.)
• 1 Stonehenge World Heritage Site (England)

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