The fragile future of the cradles of civilization in the Anthropocene

From the rise of the first power centers and city-states in Mesopotamia, the Nile delta and the Asian deltas, this study reveals how the natural growth of these deltas - fed by river sediments - accompanied human progress. Deltas have fostered innovations in water management, subsidence control and erosion mitigation, creating a profound interdependence between human civilization and these dynamic environments. However, while deltas continue to support megacities and vast economic activities, they are under increasing pressure in the Anthropocene.

The sea is rising and deltas are sinking

To ensure their sustainability, deltas must withstand the rise in sea level caused by global warming. Yet human pressures and reduced sediment supply are making them increasingly vulnerable, posing a major threat to their survival. The study outlines the critical challenges facing deltas, including governance, management and planning, and highlights the importance of new technologies and strategies to address these issues. Despite potential solutions, the authors stress that without climate stabilization, it will be extremely difficult to preserve deltas. In scenarios of extreme sea-level rise (up to or exceeding two meters in the next two centuries), deltas could progressively sink, making human life and economic activities in these regions unsustainable.

This article therefore envisages a future marked by mass migrations from flooded deltas to higher ground, potentially ending the long relationship between humans and deltas. Ultimately, the world may have to adapt to living with partially or fully submerged deltas.