Culprit for Mass Extinction 445 Million Years Ago? Global Warming - The New York Times
https://www.nytimes.com/2020/06/10/science/global-warming-ordovician-extinction.html
Large amounts of mercury discovered in Greenland′s glaciers | Science| In-depth reporting on science and technology | DW | 18.06.2021
https://www.dw.com/en/large-amounts-of-mercury-discovered-in-greenlands-glaciers/a-57953809