This lesson plan is designed to help students use what they know about speciation, extinction, and biodiversity to invesitgate how human activity affects biodiversity and possible solutions for sustaining biodiversity. Before starting the lesson, students read the interview "Speciation and Biodiversity (Feb. 2002) with E.O Wilson. http://www.actionbioscience.org/biodiversity/wilson.html. The lesson plan includes handouts that ask the students to investigate the criteria for biodiversity hotspots, to create a campaign to buy environmentally-sensitive land to support ecosystem sustainability, and to consider the relationship between economics and the environment. The page with the Wilson interview contains links for more information for students and educators.