In the face of injustice, people band together to work for change, and through their influence, what was once unthinkable becomes common. This title traces the history of the green movement in the United States, including the key players, watershed moments, and legislative battles that have driven social change. Iconic images and informative sidebars accompany compelling text that follows the movement from the work of nineteenth-century conservationists through activists' work to stop pollution and save endangered species and up to the efforts to combat climate change and global warming in the twenty-first century. Features include a glossary, selected bibliography, Web sites, source notes, and an index, plus a timeline and essential facts. Aligned to Common Core Standards and correlated to state standards. Essential Library is an imprint of Abdo Publishing, a division of ABDO.