author, attorney, and environmental historian Lowell E. Baier celebrates 50 years of the landmark Endangered Species Act of 1973, a bipartisan law passed by Congress and signed into law by President Richard M. Nixon. Baier provides an insightful and entertaining history of the ESA's dramatic highs and lows. His own work with the ESA from its inception to the present, and with the key figures who shaped its history, from field biologists to Presidents of the United States, give the book a unique, human element. He looks back at a lifetime of environmental advocacy and tackles one of today's leading challenges: the unprecedented decline in species due to climate change. Drawing from his extensive experience as a negotiator and activist, Baier argues that the ESA is flexible enough to ameliorate the biodiversity crisis while still respecting landowners, states, and industries. He ultimately calls on all Americans to embrace a spirit of bipartisanship and conservation to strengthen the law that has been Earth's emergency room for half a century.