/newsroom/taxonomy/term/15948/all en /newsroom/channels/news/narwal-tusks-reveal-mercury-exposure-related-climate-change-330059 <p>In the Arctic, climate change and pollution are the biggest threats to top predators like narwhals. 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.</p> Mon, 29 Mar 2021 14:13:31 +0000 shirley.cardenas@mcgill.ca 257550 at /newsroom