Anytime a governmental unit authorizes lethal measures as a way to control animal population, there are those in the human population that get upset. Such is the case of the Michigan Department of Natural Resources management plan for Mute Swans in Michigan. On last week’s “Issues of the Environment,” David Fair discussed the state action plan with Holly Vaughn of the Michigan DNR. This week, he talks with John Griffin, Director of Urban Wildlife at The Humane Society of the United States, for