The core constraints identified in AR5  for freshwater- related adaptation were lack of governance, financial resources and information, while water availability was singled out as a core constraint to diversifying options for water-dependent sectors. SR1.5 showed that increasing aridity and decreased freshwater availability, including limited groundwater supply in fossil aquifers in conjunction with rising sea levels may pose hard limits to adaptation for small islands . SR1.5 also shows that water-related risks can be reduced substantially by limiting warming to 1.5℃  , thereby also reducing the potential to reach hard limits to adaptation. SROCC highlighted that several barriers and limits to adapt to reduced water availability in mountain areas, such as lack of finance and technical knowledge . The SRCCL further highlighted the critical importance of water-related climate change adaptation and potential limits to adaptation in the
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report