National and global security can be assessed in many ways but one underlying factor for all humanity is access to reliable sources of water for drinking, sanitation, food production and manufacturing industry. In many parts of the world, population growth and an escalating demand for water already threaten the sustainable management of available water supplies. Global warming, climate change and rising sea level are expected to intensify the resource sustainability issue in many water-stressed regions of the world by reducing the annual supply of renewable fresh water and promoting the intrusion of saline water into aquifers along sea coasts, where 50% of the global population reside. Pro-active resource management decisions are required, but such efforts would be futile unless reliable predictions can be made about the impact of the changing global conditions on the water cycle and the quality and availability of critical water reserves. Addressing this wide spectrum of issues, a team of expert authors discusses here the impacts of climate change on the global water resources, the long-term resource management goals at global and local scales, the data requirements and the scientific and technical advances necessary to mitigate the associated impacts.

Water security in a changing climate Effect of climate change water resources Sustainability of surface and subsurface waters

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Resilience Analysis of Climate Change Effects on Water Quality and Health.- Implications of Climate Change on Water Security in the Mediterranean Region.- Climate Change Effects on Ecosystem Services in the United States Issues of National and Global Security.- Climate Change Mitigation with Renewable Energy: Geothermal.- Climate Change and Water Resources Challenge of our Civilisation.- Impacts of Decreasing Recharge Rates on Sustainable Groundwater Management.- A Model for Integrated Water Resources Management in Water-Scarce Regions: Minimization of the Impacts of Groundwater Exploitation on Society and the Environment.- Assessing the Impact of Climate Change on Groundwater Resources Using Groundwater Flow Models.- Management of Karst Aquifers Under Climate Change: Implications for Sustainable Use.- Impact of Climate Change on Hydropower Generation and Irrigation: A Case Study from Greece.- Analysis of Climate Change Effects on Floods Frequency through a Continuous Hydrological Modelling.- Potential Impacts of Climate Change on Turkish Water Resources: a Review.- Impacts of Climate Change on Groundwater Resources: Review of a Case Study in Azerbaijan.- The Global Climate Change Impact on Water Resources of Armenia.- Regional Climate Changes in Kyrgyzstan: Impact of Natural and Anthropogeneous Factors.- Manufactured Nanoparticles: A New Threat to the Security of Some Groundwater Supplies?.- Regulation of Cyanobacteria in Large Open Water Reservoirs.- Risk Characterization of Contaminated Water Pathways and Toxicity Determination.- Improved Methods for Conducting the Cadastre of Meliorative Condition in Irrigated Areas Subject to Climate Change.- Trends of Irrigation Development in the Kyrgyz Republic within the Context of Climate Change.- Groundwater Evapotranspiration Underestimated Role of Tree Transpiration and Bare Soil Evaporation in Groundwater Balances of Dry Lands.- Modeling Water Stress Effect on Soil Salinity.-Climate Changes in Republic of Macedonia.- Water Governance in Bulgarian Agriculture.- Influence of Climate Change on Shallow Groundwater Resources: The Link between Precipitation and Groundwater Levels in Alluvial Systems.- Evaluation of Four Climate Changes Scenarios on Groundwater Resources of the Escusa (Castelo de Vide) Aquifer, Central Portugal.- Classification of Groundwater Quality Based on Variability of Hydrogeochemical Environment.- Climate Change and the Hydrogeologic Framework in Constanta City, South Dobrogea, Romania.- Using Numerical Modeling for Assessment of Pollution Probability of Drinking Water Resources in Borjomi Region (Southern Georgia).- Modeling of the Tbilisi (Georgia) Geothermal Deposit under Climate Change Conditions.- Future of Water Resources and Wastewater Reuse in Turkey.- Reuse of Urban Wastewater in Environmentally Protected Areas: The Case Studies of Messolonghion Lagoon, Greece.