River deltas: Valuable and under threat

River deltas contribute more than 4% of the global GDP, 3% of global crop production, and are home to 5.5% of world's population.

Stanford University-led study: Sinking land due to human activities puts coastal populations most at risk.

Sinking lands amplifies the effect of rising seas, a combination could cause significant parts of the world's largest Deltas to fall below sea by the end of the century.