Biointeractive’s Holiday Lectures on Science series brings current research into the classroom, bridging the gap between textbook science and real life science. The Biodiversity in the Age of Humans series asks powerful questions, such as: Are we witnessing a sixth mass extinction? What factors threaten ecosystems on land and in the sea? What are researchers doing to conserve biodiversity and ecosystems around the world? What tools do we have to avoid a global catastrophe? In six half-hour lectures, three leading scientists describe the state of biodiversity on our planet and how to face the great challenges that lie ahead.