Lester R. Brown, whom the Washington Post praised as "one of the world's most influential thinkers," built his understanding of global environmental issues from the ground up. Brown spent his childhood working on the family's small farm. His entrepreneurial skills surfaced early. Even while excelling in school, he launched with his younger brother a tomato-growing operation that by 1958 was producing 1.5 million pounds of tomatoes. Later, at the...