• 81 Videos, Slides, Films

• 29 Technology
• 24 Social aspects
• 22 Population
• 21 History
• 15 Biodiversity
• 15 Biosphere
• 15 Biotic communities
• 15 Ecology
• 13 Civilization, Ancient
• 12 Assimilation (Sociology)
• 12 Biogeography
• 12 Research
• 12 Social evolution
• 12 Social structure
• 12 Tribes
• 11 Social ecology
• 10 Forecasting
• 10 Science
• 9 Archaeology
• 9 Biology
• 9 Biotechnology
• 7 Christianity
• 7 Cultural geography
• 7 Deserts
• 7 Environmental aspects

• 81 English

• 4 Europe
• 3 Arabian Peninsula
• 3 China
• 3 Middle East
• 1 Africa
• 1 Africa, North
• 1 Amazon River
• 1 Atacama Desert (Chile)
• 1 Cuba
• 1 Cyprus
• 1 East Asia
• 1 Fiji
• 1 Galapagos Islands
• 1 Gobi Desert (Mongolia and China)
• 1 Iceland
• 1 India
• 1 Namibia
• 1 Peru
• 1 Red Sea
• 1 South America
• 1 South Asia
• 1 Thar Desert (India and Pakistan)
• 1 United States
• 1 Zanzibar

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