Human-made channels are aggravating the harsh effects of climate change, shaking up coastal wildlife and seafood supplies. In recent decades, Louisiana's Mississippi Delta has faced a trove of environmental disasters that have heavily impacted the region's coastal wildlife and seafood supplies. In 2019, record flooding across the Midwest caused diverted river water to inundate the saltier coastal waters. At the same time, the Delta's rich estuaries have been invaded by salt water through a maze of man-made channels, aggravating the harsh effects of climate change. Special correspondent Joshua Landis reports as part of our series, "Peril and Promise."