Nitrate levels in Lake Superior, which have been rising steadily over the past century, are about 2.7 percent of the way toward making the lake's water unsafe to drink, according to a study by University of Minnesota (UMN) researchers.
The study, funded by the National Science Foundation (NSF), is published online this week in the journal Geophysical Research Letters.
The complexity of the causes underlying the increase makes it difficult to predict when the water cou More ...
Nitrate levels in Lake Superior, which have been rising steadily over the past century, are about 2.7 percent of the way toward making the lake's water unsafe to drink, according to a study by University of Minnesota (UMN) researchers.