First, approximately half the world's population  are assessed as being currently subject to severe water scarcity for at least some part fo the year  due to climatic and non-climate factors . Water insecurity arises from many factors, both environmental and societal. Environmental factors include too little freshwater due to drought or pollution, and too much water, due to extreme precipitation and flooding, and are being affected by climate change. Societal factors include economic and governance- related barriers to water access or protection from water-related damages. Currently, many people are experiencing climate change on a day-to-day basis through water-related impacts such as the increased frequency and intensity of heavy precipitation  ; accelerated melting of glaciers  ; changes in frequency, magnitude and timing of floods  ; more frequent and severe droughts in some places  ; decline in groundwater storage and reduction in recharge   and water quality deterioration due to extreme events  . For example, since the 1970s, 44% of all disaster events have been flood-related . With the added stressor of climate change, globally, a larger fraction of land and population are projected to face increased water scarcity due to climate change. For example, at an approximately 2℃ GWL, between 0.9 and 3.9 billion people are projected to be at increased exposure to water stress, depending on regional patterns of climate change and the socioeconomic scenarios considered .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report