Limits to Growth, a study of the patterns and dynamics of human presence on earth, pointed toward environmental and economic collapse within a century if "business as usual" continued. In 1972, the book's findings sparked a worldwide controversy about the earth's capacity to withstand constant human and economic expansion. More than 40 years later, with more than 10 million copies sold in 28 languages, this "little book with powerful ideas" endures as a touchstone for anyone seeking to understand the complex relationships underlying today's global environmental and economic trends.