This book presents more than 350 biographies of men and women who have devoted their lives to studying, debating, and organizing controversial environmental issues over the last 200 years. In addition to the scientists who have analyzed how human actions affect nature, we are introduced to poets, landscape architects, presidents, painters, activists, even sanitation engineers, and others who have forever altered how we think about the environment. The easy to use A-Z format provides instant access to these individuals, and frequent cross references indicate others with whom individuals worked (and sometimes clashed). End of entry references provide users with a starting point for further research.