Our delicately balanced and finely tuned endocrine system determines how we grow, how we mature, and how - and even if - we can reproduce. Chemicals in the food we eat, the water we drink, the air we breathe and even the products we buy are interfering with that system, dramatically diminishing our ability to reproduce. World renowned epidemiologist Dr. Shanna Swan joins Patti and Doug on this week's Green Street to talk about her new book "Countdown."
