there has been an increasing reliance on groundwater in South Asia for irrigation . It is noteworthy that India, Bangladesh, Pakistan and China together account for more than 50% of the world's groundwater withdrawals . A study conducted in the Shahpur and Maner districts of Bihar, India, in which drinking water sourced from the groundwater of 388 households was tested, showed that 70-90% of the sampled household's drinking water contained either arsenic or iron, or both . Given the nexus between CIDs and non-climate drivers, an effective adaptation to the impacts of climate change would also demand sustainable development and management of shared aquifer resources, which in turn require reliable TBA inventories and improved knowledge production and knowledge sharing on the shared groundwater systems .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report