A descent through the hellish atmosphere of Venus to explore its broiling surface serves as a warning to our world about the possible consequences of the increasing greenhouse effect.

Then Dr. Sagan leads us on a tour of our solar system to see how other heavenly bodies have suffered from various cosmic catastrophes.

(Part 4/13)

Other Episodes:
Episode 1: The Shores of the Cosmic Ocean
http://www.videosift.com/video/Carl-Sagan-Cosmos-1-The-Shores-of-the-Cosmic-Ocean
Episode 2: One Voice in the Cosmic Fugue
http://www.videosift.com/video/Carl-Sagan-Cosmos-2-One-Voice-in-the-Cosmic-Fugue
Episode 3: The Harmony of the Worlds
http://www.videosift.com/video/Carl-Sagan-Cosmos-3-The-Harmony-of-the-Worlds
Episode 5: Blues for a Red Planet
http://www.videosift.com/video/Carl-Sagan-Cosmos-5-Blues-for-a-Red-Planet
Episode 6: Travellers' Tales
http://www.videosift.com/video/Carl-Sagan-Cosmos-6-Travellers-Tales
Episode 7: The Backbone of Night
http://www.videosift.com/video/Carl-Sagan-Cosmos-7-The-Backbone-of-Night
Episode 8: Journeys in Space and Time
http://www.videosift.com/video/Carl-Sagan-Cosmos-8-Journeys-in-Space-and-Time
Episode 9: The Lives of the Stars
http://www.videosift.com/video/Carl-Sagan-Cosmos-9-The-Lives-of-the-Stars
Episode 10: The Edge of Forever
http://www.videosift.com/video/Carl-Sagan-Cosmos-10-The-Edge-of-Forever
Episode 11: The Persistence of Memory
http://www.videosift.com/video/Carl-Sagan-Cosmos-11-The-Persistence-of-Memory
Episode 12: Encyclopedia Galactica
http://www.videosift.com/video/Carl-Sagan-Cosmos-12-Encyclopedia-Galactica
Episode 13: Who Speaks for Earth?
http://www.videosift.com/video/Carl-Sagan-Cosmos-13-Who-Speaks-for-Earth
Interview with Carl Sagan
http://www.videosift.com/video/Carl-Sagan-Interview-1989