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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
The Real History of Science Fiction
The Real History of Science Fiction

   2014    Technology
Breakthrough
Breakthrough

   2015    Medicine
The Private Life of Plants
The Private Life of Plants

   1994    Nature
Seven Ages of Rock
Seven Ages of Rock

   2007    Art
Wings
Wings

      Nature
Wonders of Life
Wonders of Life

   2013    Science
Wild South America
Wild South America

   2005    Nature
Empire of the Tsars
Empire of the Tsars

   2017    History