The Delta at Risk study is a global, systematic assessment of how delta risk is increasing due to sea-level rise and human drivers of delta land subsidence. Risk is expected to increase greatly due to relative sea-level rise in deltas. Relative sea-level rise (the combination of offshore sea-level rise and coastal land subsidence) will have a large impact on coastal communities due to coastal flooding. Wealthy countries however have a greater social capacity and wealth to mitigate against such hazards but the economic costs is high. The study utilizes decade-to-century economic trend forecasts to estimate the varying impact on delta risk across each delta system. Efforts to address the root causes of land subsidence in the near-term are critical for long-term sustainability.