For our latest ‘On the horizon’ post, Colleen Seymour explains how climate change could release vast amounts of mercury into the environment as permafrost melts. Hat making was a particularly hazardous occupation in the 17th century.  Mercuric nitrate was used to soften pelts, and its use in poorly-ventilated rooms almost inevitably led to mercury (Hg) poisoning (‘mecurialism’), which manifested as a combination of psychoses, physical … Continue reading On the horizon: mercury rising