The AP reports:
Scientists think they know why some European glaciers started to shrink decades before climate change had begun to raise temperatures.
It wasn’t warming that attacked the glaciers, they say in the Proceedings of the National Academy of Sciences. It was soot from industry, steam locomotives and domestic fires.
Glaciologists have for years been puzzled by the sudden start in the middle of the 19th century of the retreat of the Alpine glaciers, which number around 4,000.