Over the past 30 years, there has been more than a 90-percent decline in the numbers of monarch butterflies, and much of that can be attributed to loss of habitat. There is ongoing consideration of adding them to the endangered species list, and, in "Issues of the Environment," 89.1 WEMU’s David Fair explores what that means to humans and our ecology in a conversation with the David Clipner, the Director of Education and Wildlife at the Leslie Science and Nature Center in Ann Arbor.