A lifelong environmentalist, Annie Proulx brings her witness and research to the subject of wetlands and the vitally important yet little understood role they play in preserving the environment--by storing the carbon emissions that accelerate climate change. Fens, bogs, swamps, and marine estuaries are the earth's most desirable and dependable resources, and in four stunning parts, Proulx documents the long-misunderstood role of these wetlands in saving the planet.