About 25 square miles of coastal Louisiana disappear every year as a result of human activities up and down the Mississippi River, threatening waterborne commerce, oil and gas production, commercial fishing, wildlife, and area residents.

Formed about three years ago with $3 million in initial funding from Shell Oil, the America's Wetland: Campaign to Save Coastal Louisiana has sought to raise awareness in the state and nationwide about the dangers of coastal erosion. Another goal is to foster support for engineering ...