Environmental estrogens are chemicals that mimic natural hormones, and a new scientific study shows that they may be having an effect on fish populations in two Alberta rivers. Tyler Irving speaks with Hamid Habibi, professor at the University of Calgary, and one of the authors of this latest study.

In the early 1990s, Don Gamble was an environmental consultant working on high-profile jobs for organizations such as the Canadian government and the World Bank. But when he began to feel that his work was no longer satisfying, he decided to make an extreme change in his life; he sold his house, quit his job, and has been living as Swami Sivananda ever since. What does it mean to make such a dramatic change in lifestyle? Peter Stock tracked down Don Gamble and produced this radio documentary.