Global total and non-renewable groundwater withdrawals are projected to increase from 952 km3 year-1  to 1621 km3 year-1  and from 304 km3 year-1  to 597 km3 year-1 , respectively . At the same time, groundwater depletion is projected to increase from approximately 204  km3 year-1 in 2000 to 427  km3 year-1 by 2099 . Much of the projected depletion is a function of increased future abstraction of groundwater for irrigation and increased ET  in a warmer climate. For example, the projected doubling of average water use by 2050 in Tunisia is attributed partly  to climate change and mainly to socioeconomic policies . Similarly, groundwater depletion in the Bengal Basin and North China Plain is more due to irrigation development than climate change per se .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report