In the 1950’s scientists began to realize that fallout from nuclear testing was moving through the environment and up the food chain. Since that point, it seems that each year another chemical substance is found to be toxic and then pulled off the market only to be replaced by a slew of other chemicals. John Wargo is a professor of environmental policy and risk analysis at Yale University. He talks with host Steve Curwood about his new book, Green Intelligence: Creating Environments that Protect Human Health, and explains which chemicals threaten us and how the government can better protect us from these risks.