In just 80 years, some 2,000 square miles of its coastal landscape have turned to open water, wiping places off maps, bringing the Gulf of Mexico to the back door of New Orleans and posing a lethal threat to an energy and shipping corridor vital to the nation’s economy. In Losing Ground, coauthors Bob Marshall, the Lens, Brian Jacobs and Al Shaw, ProPublica, provide a detailed analysis of why Louisiana is losing wetlands at the rate of one football field every year. Particularly interesting is an interactive map showing land loss between 1922 and 1994 in different coastal regions. Read Part Two.