Earlier this year, scientists reported that radioactive fallout from nuclear accidents and weapons testing is present in ice sediments on the surface of glaciers in the Arctic, Iceland, the Alps, the Caucasus, British Columbia and Antarctica.

The presence of this radioactivity poses a potential problem to humans and animals living near glaciers. As the ice melts as a result of climate change, the radioactive fallout could wind up in rivers and streams, and potentially make its way up the food chain.

In the latest episode of Third Pod from the Sun, University of Plymouth scientist Caroline Clason details how she and her team discovered the radioactive fallout on the glaciers and what questions they are still investigating, including the potential effect of the radionuclides on ecosystems.

This episode was produced by Nanci Bompey and Lauren Lipuma and mixed by Robyn Murray and Jon Schriner.