The culprit, he says, may be calcium chloride road salt, used to de-ice highways in the winter.

法南姆表示，造成这种状况的罪魁祸首可能是冬季用来为高速公路除冰的氯化钙路盐。

They also say there are growing signs that road salt is getting into freshwater.

他们还说，越来越多的迹象表明道路盐正在进入淡水。

Victoria Kelly is a road salt expert at the Cary Institute of Ecosystem Studies in New York.

维多利亚·凯利 (Victoria Kelly) 是纽约卡里生态系统研究所的路盐专家。

“In my opinion, we are always going to be using some degree of road salt, ” he said.

“在我看来，我们总是会使用一定程度的道路盐，”他说。

Well, in 2018 in the United States, I learned that 43 percent of the salt consumed in the US was used for road salt deicing purposes.

好吧， 2018 年在美国，我了解到美国消耗的盐中有 43% 用于道路盐除冰。