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Amazon deforestation reduces rainfall and river flow, leading to significant energy and revenue losses for Brazil's largest hydroelectric plants. Together, Itaipu and Belo Monte lose an estimated 3,780 GWh of generation potential annually, equating to approximately US$ 200 million in lost revenue. The report emphasizes the need to integrate forest conservation and restoration policies with energy security strategies to protect the national electricity mix.

The document identifies a strong correlation between Pacific sea surface temperature patterns and water availability in the Andes of central Chile and Argentina. It highlights that El Niño years typically correspond with high snowpack and streamflow, while La Niña years often align with low levels. Furthermore, the document links multi-decadal shifts in the Pacific Decadal Oscillation (PDO) to significant changes in mean annual river discharges, suggesting that the interplay between ENSO and PDO is critical for forecasting future water scarcity.

The study assesses the impact of dam operations and climate change on the Mond River and its downstream estuary. While dams cause 'drastic' to 'severe' flow alterations in the river corridor, remote sensing indicates that climate change factors—specifically sea-level rise in the Persian Gulf and meteorological drought—have a more significant impact on the Mond-Protected Area than upstream river regulation or land-use change.

The July 2021 floods in Western Europe were driven by extreme rainfall from the low-pressure system 'Bernd', compounded by pre-existing wet soil conditions. While attribution for small catchments like the Ahr and Erft is challenging due to high natural variability, a broader 'Pooling Region' analysis indicates that climate change increased the intensity of maximum 1-day rainfall by 3-19% and its likelihood by a factor of 1.2 to 9 compared to a climate 1.2 °C cooler. Future projections suggest further increases in intensity and frequency in a 2 °C warmer climate.

The report examines the causes and consequences of water scarcity in Bangladesh, focusing on the Ganges-Brahmaputra-Meghna (GBM) basin. It analyzes bilateral water treaties between India and its neighbors (Pakistan, Nepal, and Bangladesh) and evaluates the effectiveness of multilateral organizations like the Nile Basin Initiative and the Mekong River Commission to identify best practices for regional cooperation. Primary research indicates a long-term decline in the dry-season flow of the Padma River, potentially exacerbated by the Farakka Barrage, while rainfall patterns remain largely stable. Stakeholder mapping reveals significant communication gaps between policymakers and affected populations, and the report suggests that water scarcity can act as a trigger for localized conflict, particularly in the Padma basin.

The Andean snowpack is the primary water source for households, agriculture, industry, hydropower, and ecosystems in semi-arid central Chile and central-western Argentina. Analysis of regional composite data shows that winter snowpack and river streamflow are closely related and influenced by large-scale Pacific surface temperature changes. High snowpack and streamflow coincide with warm El Niño events, while most extreme dry years occur during cold La Niña events. Additionally, shifts in the Pacific Decadal Oscillation (PDO) in the mid-1940s and 1976-77 correspond to a 27% decrease and 28% increase in mean annual river discharges, respectively, suggesting the PDO causes low-frequency hydrologic variations. While lower PDO values in the late 1990s were not matched by streamflow records—possibly due to melting glaciers—the interplay between ENSO and PDO is highlighted as critical for improving water scarcity forecasts under a changing climate.

The document examines the relationship between Pacific Ocean temperature patterns and water availability in the semi-arid regions of central Chile and west-central Argentina. It identifies that winter snowpack is the primary water source for these areas and is strongly influenced by ENSO and PDO cycles. Specifically, El Niño events correlate with high snow and flow, while La Niña events generally correlate with dry years. The document also notes that shifts in the PDO in the 1940s and 1970s coincided with significant changes in average river flows, suggesting that multidecadal PDO behavior drives low-frequency hydrological variations in the region.