https://m.youtube.com/watch?v=JvrHzqMrXNM
Carl Sagan and other Cold War scientists once feared that a nuclear war could plunge the world into a deadly ice age. Three decades later, does this theory still resonate?

Produced by: RETRO REPORT
Read the story here: http://nyti.ms/1ViENQG

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تاریخ انتشار در یوتیوب : 11 آوریل 2016