Leonard Nimoy narrates this 21 minute 1978 documentary and brings on many experts and scientists explaining the prevailing hypothesis at the time that the world would be engulfed in a new ice age, complete with predictions that entire portions of the US would be covered in ice sheets in 30 years.

https://youtu.be/zSDLRm3jhc8 via /r/videos https://ift.tt/2RQCKai