This 3 sentence summary provides the key points from the document: The presentation discusses several issues related to river erosion, flooding, and water scarcity in Bangladesh, including people losing possessions to river erosion, floods damaging city areas, and shrimp dying due to mixing of pure and salty water which is affecting tigers in the Sundarbans forest. A new study also found the Sundarban coast is retreating up to 200 meters per year as the mangrove forest's health deteriorates rapidly from river water mixing with salty water.