these pollutants are bringing irreversible changes to the planet, pushing species including our own beyond a safe operating space as they call it. and this comes as a study, here in the uk, found toxic forever chemicals used in non stick saucepans and food packaging have been found in otters across england and wales. the substances, called pfas, are also used in waterproof clothing, stain resistant products and fire retardants. the chemicals are linked to pregnancy complications, liver disease, cancer and other illnesses. scientists from cardiff university say concentrations of these compounds in otters are a guide to levels of pollution in the environment. well, let s bring in environmental chemist, professor miriam diamond from the university of toronto, where she joins us from. you are responsible for this