Editor Viqi Wagner has compiled several essays in a for-or-against sequence that debate four major questions. Is species extinction a serious threat? Is global warming endangering plant and animal species? Are international efforts to preserve endangered species effective? How should humans respond to species decline? With more than one intelligent viewpoint to consider, readers will have a lot to think about. They will use critical thinking skills to develop their own intelligent opinions. This resource is also excellent for report-writing and researching. Superb essay sources include the Intergovernmental Panel on Climate Change, Millennium Ecosystem Assessment, Environment News Service, and World Climate Report.