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In this installment of the award-winning series Cosmos, Dr. Carl Sagan takes viewers into the Venusian atmosphere to deliver a lesson on possible repercussions of the greenhouse effect. The noted author and astronomer explains complex subjects in an engaging and informative manner that is not difficult to understand. Accessibility to the subject enabled millions of viewers to appreciate the series. Cosmos, Episode 4: Heaven and Hell, through the magic of special effects, also explores the Solar System to observe the effects of dramatic cosmic events on other objects in space.