• 2 Videos, Slides, Films

• 1 DVDs

• 1 Environmental conditions
• 1 Global temperature changes
• 1 Global warming
• 1 Greenhouse effect, Atmospheric
• 1 Lakes
• 1 Permafrost
• 1 Sinkholes

• 1 Alda, Alan, 1936-
• 1 Angier, John
• 1 Blink Films
• 1 Boffey, Mercer
• 1 Chedd-Angier Production Company
• 1 Connecticut Public Television
• 1 Habeger, Brice
• 1 PBS Home Video
• 1 Public Broadcasting Service (U.S.)
• 1 Tanner, Nick
• 1 WGBH (Television station : Boston, Mass.)

• 2 English

• 1 Arctic regions

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