Study finds mercury-tainted fish in Glacier's Lake McDonald

[Ptah]

2. From the linked article:

Mercury concentrations in fish are of particular concern to children, and to women
of child-bearing age. Mercury is distributed on a global scale from natural sources,
such as volcanic eruptions, and human sources, such as burning fossil fuels in power plants.
It is also distributed on local scales as a result of mining activities.

The human-caused mercury distribution has increased the levels of atmospheric mercury
between three and five times in the past 150 years, according to the report.