Book excerpt: It's easy to feel powerless in the face of big environmental challenges--but we need inspiration now more than ever. In Nature's Allies, Larry Nielsen presents the inspiring stories of eight conservation pioneers who show that through passion and perseverance we can each make a difference, even in the face of political opposition. Nielsen's vivid biographies of John Muir, Ding Darling, Aldo Leopold, Rachel Carson, Chico Mendes, Billy Frank Jr., Wangari Maathai, and Gro Harlem Brundtland are meant to rally a new generation of conservationists to follow in their footsteps and inspire students, conservationists, and nature lovers to speak up for nature and prove that individuals can affect positive change in the world.