DECCMA has released a new infographic that summarises what we know about deltas in the present and future. Deltas are already exposed to sea level rise, coastal erosion, flooding and salinisation. In the future climate risk will increase beyond 2050, but the particular nature of hazards differs between deltas. In the Volta in Ghana, for example, erosion and flooding is driven by waves and sea level rise; whereas the future of the Ganges-Brahmaputra-Meghna is more dependent on sediment input than other deltas.
Deltas are already important contributors to national economies. In the future agriculture will become less significant in economies due to land degradation and erosion, but models show a slight increase in the productivity of brackish fisheries.
People in deltas are already mobile but in future mobility will be exacerbated by the effects of climate and environmental stresses on livelihood options.
Adaptation is already taking place, but more will be required in future. Infrastructural adaptations, such as dykes and embankments, are required, as is effective planning, such as the Bangladesh Delta Plan 2100. Policy frameworks should be revisited to enable gender-equitable adaptation and support for internally displaced persons. Migration also provides opportunities for adaptation.