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[Facts and Figures] The United Nations World Water Development Report 2019: Leaving No One Behind; Facts and Figures 발행 연도: 2019 저자: Engin Koncagül | Michael Tran | Richard Connor | Stefan Uhlenbrook 단체 저자: UNESCO World Water Assessment Programme (WWAP) Water availability and demandFigure 1 provides a global overview of countries experiencing different levels of water stress (the ratio of total freshwater withdrawn annually by all major sectors, including environmental water requirements, to the total amount of renewable freshwater resources, expressed as a percentage).Over 2 billion people live in countries experiencing high water stress. Recent estimates show that 31 countries experience water stress between 25% (which is defined as the minimum threshold of water stress) and 70%. Another 22 countries are above 70% and are therefore under serious water stress (UN, 2018a).Growing water stress indicates substantial use of water resources, with greater impacts on resource sustainability, and a rising potential for conflicts among users.It has been estimated that about 4 billion people, representing nearly two-thirds of the world population, experience severe water scarcity during at least one month of the year (Mekonnen and Hoekstra, 2016). 
[Facts and Figures] The United Nations World Water Development Report 2020: Water and Climate Change; Facts and Figures 발행 연도: 2020 저자: Engin Koncagül | Michael Tran | Richard Connor 단체 저자: UNESCO World Water Assessment Programme (WWAP) Since the mid-20th century, changes in the intensity and frequency of extreme weather and climate events have been observed, including a decrease in cold temperature extremes, an increase in warm temperature extremes, an increase in extremely high sea levels and an increase in the number of heavy precipitation events in a number of regions (Min et al., 2011).Climate projections indicate with high confidence that extreme precipitation events will become more intense and frequent in many regions, but also that heatwaves will occur more often and last longer. The former will increase global flood risk (Hirabayashi et al., 2013), while the latter is expected to make droughts more intense (Trenberth et al., 2014). These risks are unevenly distributed geographically, and are generally larger for vulnerable people and communities in countries at all levels of development (IPCC, 2014a). Figure 1. Global water withdrawals throughout the previous centuryFigure 2. Climate change scenario trends in water availabilityFigure 3. Annual baseline water stressFigure 4. Seasonal variabilityFigure 5. World weather-related natural catastrophes by peril, 1980–2018Figure 6. Spatial distribution of water-related disasters (droughts, floods, landslides and storms), 2001–2018Figure 7. Spatial distribution of floods, 2001–2018Figure 8. Spatial distribution of droughts, 2001–2018Figure 9. Electricity consumption in the water sector by process, 2014–2040Figure 10. Number of people living under water stress under the Baseline Scenario [Faits et chiffres] Rapport mondial des Nations Unies sur la mise en valeur des ressources en eau 2020: l'eau et les changements climatiques, faits et chiffres 발행 연도: 2020 저자: Engin Koncagül | Michael Tran | Richard Connor 단체 저자: UNESCO World Water Assessment Programme (WWAP) Depuis le milieu du 20e siècle, on a observé des changements dans l’intensité et la fréquence des phénomènes météorologiques et climatiques extrêmes, notamment une diminution des extrêmes de température froide et une augmentation des extrêmes de température chaude, des niveaux de mer extrêmement élevés et du nombre de fortes précipitations dans un certain nombre de régions (Min et al., 2011).Les projections climatiques indiquent avec une grande confiance que les précipitations extrêmes deviendront plus intenses et plus fréquentes dans de nombreuses régions, mais aussi que les vagues de chaleur seront plus fréquentes et dureront plus longtemps. Les premières augmenteront le risque d’inondation au niveau mondiale (Hirabayashi et al., 2013), tandis que les dernières devraient rendre les sécheresses plus intenses (Trenberth et al., 2014). Ces risques sont répartis géographiquement de façon inégale et ils sont généralement plus importants pour les personnes et les communautés vulnérables dans les pays à tous les niveaux de développement (GIEC, 2014a). Figure 1. Préèements d’eau dans le monde au cours du 20e sièleFigure 2. Tendances des scéarios de changement climatique en matièe de disponibilitéde l’eauFigure 3. Stress hydrique annuel de référenceFigure 4. VariabilitésaisonnièeFigure 5. Catastrophes naturelles mondiales liées au climat, par risque et par nombre d’événements pertinents,1980–2018Figure 6. Réartition spatiale des catastrophes liés àl’eau (séheresses, inondations, glissements de terrain et tempêes) 2001–2018Figure 7. Répartition spatiale des inondations, 2001–2018Figure 8. Répartition spatiale de sécheresses, 2001–2018Figure 9. Consommation d’électricité dans le secteur de l’eau, par procédé, 2014–2040Figure 10. Nombre de personnes en situation de stress hydrique selon le scénario de référence