Narwal tusks reveal mercury exposure related to climate change

In the Arctic, climate change and pollution are the biggest threats to top predators like narwals. Studying the animals' tusks reveals that diet and exposure to pollution have shifted over the past half century in response to sea-ice decline. Human emissions have also led to a sharp rise in the presence of mercury in recent years, according to an international team of researchers.

from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/03/210329122743.htm