In assessing future climate change risks the IPCC [Intergovernmental Panel on Climate Change] makes use of 58 standardized geographical reference regions. Based on six water-related stressors and the affected population living a each of the 58 IPCC regions, the investigation finds that
East Asia and ... South Asia [fare facing a] disproportionate share of risk ... Together, these two regions account for 67% of populations globally susceptible to groundwater depletion, 60% for floods, 48% for eutrophication and overuse. ... South Asia’s share of global population-adjusted water risk is especially pronounced, accounting for 50% of the global population susceptible to groundwater stress, 38% to floods, and 35% to overuse ...
Eutrophication scores are particularly high in Western/Central Europe as well as in East Asia, because these regionst feature a combination of intensive agriculture and relatively high populations, according to the study.