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Heaven and Hell

   1980    Science
Sagan discusses comets and asteroids as planetary impactors, giving recent examples of the Tunguska event and a lunar impact described by Canterbury monks in 1178. It moves to a description of the environment of Venus, from the previous fantastic theories of people such as Immanuel Velikovsky to the information gained by the Venera landers and its implications for Earth's greenhouse effect. The Cosmos Update highlights the connection to global warming.
Series: Cosmos
Breakthrough
Breakthrough

   2015    Medicine
Triumph of Life
Triumph of Life

   2006    Nature
The Germanic Tribes
The Germanic Tribes

   2007    History
Dinosaur Planet
Dinosaur Planet

   2003    Science
Roman Empire: Reign of Blood
Roman Empire: Reign of Blood

   2016    History
The Story of God
The Story of God

   2016    Culture