Natural infrastructure  uses natural or semi-natural systems, for example, wetlands, healthy freshwater ecosystems, etc., to supply clean water, regulate flooding, enhance water quality and control erosion . Grey infrastructure can damage biophysical and hydrological processes, seal soils and bury streams. Compared with grey physical infrastructure, natural infrastructure is often more flexible, cost-effective and can provide multiple societal and environmental benefits simultaneously . There is increasing evidence and assessment methods on the role of NbS for climate change adaptation and disaster risk reduction at different scales  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report