In summary, climate change impacts on water resources are projected to lower GDP in many low-and middle-income countries without adequate adaptation measures . However, estimating the exact quantum of future GDP loss due to water-related impacts of climate change is fraught with several methodological challenges. Adaptation measures that focus on reducing water-related impacts of climate change will help stem losses further. Still, more work needs to be done on actual benefits and costs of adaptation strategies and residual impacts and risks of delaying adaptation action . In addition, better evidence on the costs and benefits of low-regret solutions, such as water pricing, increasing water use efficiency through technology and service improvements, and enhanced support for autonomous adaptation, is also needed for informed decision-making .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report