In 1942, MGM produced a TRAVELTALKS movie short on Glacier and Waterton National Parks.
It was mentioned that the glaciers have been receding since the last ice age and “If there is no CLIMATIC CHANGE they will be gone in a thousand years.”
So, we have had REAL global warming for the last 12,000 years! And politicians really think they can stop the warming?
Besides, forty years ago we were warned of THE COMING ICE AGE!
I have seen the TRAVELTALKS short you are speaking of and I really enjoyed it. I had it recorded on my DVR for a long time because one of the museums my wife and I volunteer at has one of the busses that were shown in the short. The bus is fully restored.
There is a national park site called the Exit Glacier in Alaska. it is a major tourist site. As you wind up the road to the ark Head quarters and the actual glacier toe, there are signs indicating the location of the glacier toe at various times.
The earliest sign is dated 1896. The government has been plotting the receding glacier on the ground continuously or more than a hundred years.
https://en.wikipedia.org/wiki/Exit_Glacier