Glaciers were observed to be retreating since the middle of the 18th century, and scientists understood that this was not likely to be caused by CO2.
RIDDLE OF THE GLACIERS.
One of the riddles which is puzzling geologists all over the world is the continuous retreat of the ice glaciers. Does this phenomenon indicate that the sun is getting hotter as some astronomers believe or is it dependent upon comparatively unimportant changes in the earth’s atmosphere ?
The steady retreat of the glaciers in New Zealand he said had been observed during the last 70 years. Photographs taken in 1896 and 1935 showed that several glaciers had retreated distances varying from 100 yards to half a mile in 40 years.
The phenomenon, however, was world-wide. Equally impressive records were obtainable from Switzerland, Scandinavia, Iceland and the United States.
In Alaska glaciers had been retreating from 100 to 200 years, the average rate of recession being about 50 feet a year. The Antarctic ice sheet also showed signs of recent retreat.
“In fact,” said Professor Speight, “no case is recorded of a region of the world in which there are present signs of an advance.