In New Zealand, many water supplies are at risk from drought, extreme rainfall events and sea level rise , exacerbated by underinvestment in existing water infrastructure  and urban densification  . Lessons can be learned from global experience . Water quality has diminished, with hotter conditions and drought causing algal blooms, combined with intensification of agricultural land uses in some areas, and heavy rainfall and sea level rise  causing flooding and sedimentation of water sources and health impacts . Some towns
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report