The Coming Ice Age, narrated by Leonard Nimoy (1978)

"Climate experts believe the next ice age is on its way. According to recent evidence, it could come sooner than anyone had expected.

"At weather stations in the far north, temperatures have been dropping for thirty years. Seacoasts long free of summer ice are now blocked year-round.

"According to some climatologists, within a lifetime we might be living in the next ice age."

From the "In Search Of" TV series.