From a 1962 edition of Life Magazine available on Google Books...
The text starts:
The giant glacier has remained unmelted for centuries. Yet the petroleum energy Humble [which merged with Standard Oil, later Exxon...] supplies -- if converted into heat -- could melt it at the rate of 80 tons each second. ... ...Bigger image here: Grist
After Sabotaging Own Oil Wells, Exxon Faces $1 Billion in Fines
Exxon Spends More on Lobbying Than Entire Clean Energy Industry Combined
Finally Truth In Oil Company Advertising! Enough Energy to Melt That Glacier
We were a bit late in picking up on this one, but it's really worth passing on anyway. So credit where credit is due: Grist had it first, then Climate Progress, and so on.