Note: Intro -- Contents -- About the Editor -- Water Footprint of Fruits in Arid and Semi-arid Regions -- 1 Introduction -- 2 Data Source and Methodology -- 2.1 Calculation of Water footprint components -- 2.2 Economical Value of Water Footprint -- 3 Water footprint components in date palm -- 3.1 Introduction -- 3.2 Cultivation Area, Crop Yield, Production, and Chemical Fertilizer Consumption -- 3.3 Water Footprint (WF) and Water Footprint Economic Value (WFEV) -- 3.4 Volume of WFCs in Each Cultivars -- 4 Water Footprint in Almond -- 4.1 Introduction -- 4.2 The Cultivation Area, Crop Yield, Production, and Chemical Fertilizer of Almond Production -- 4.3 Almond Water Footprint in Iran -- 4.4 Economic Values of Water Footprint (WFEV) in Almond -- 4.5 Volumes of Water Footprint Components in Almond Production -- 5 Water Footprint in Walnuts -- 5.1 Introduction -- 5.2 The Sown Area, Total Production, and Yield of Walnut Production -- 5.3 Walnut Water Footprint in Iran -- 5.4 Economic values of water footprint (WFEV) in walnut -- 5.5 Volumes of Water Footprint Components in Walnut Production -- 6 Conclusion and Summary -- References -- Appraising the Water Status in Egypt Through the Application of the Virtual Water Principle in the Agricultural Sector -- 1 Introduction -- 2 Material and Methods -- 2.1 Calculating the Virtual Water for Agricultural Crops -- 2.2 Calculation of the Virtual Water for Agricultural Products -- 2.3 Water Footprint and Its Indicators -- 2.4 Food Security and Food Self-sufficiency in Egypt -- 3 Results and Discussions -- 3.1 Virtual Water for Agricultural Crops -- 3.2 The Virtual Water for Agricultural Products -- 3.3 Indicators of Water Footprint -- 3.4 Food Security and Food Self-sufficiency -- 3.5 The Volume of Virtual Water Required for Self-sufficiency -- 4 Conclusion -- Appendices. , Appendix 1: The Virtual Water Volume for Selected Crops -- Appendix 2: Consumption and Food Gap for Wheat, Rice and Maize Crops -- Appendix 3A: Self-sufficiency Ratio SSR for the Wheat Crop -- Appendix 3B: Self-sufficiency Ratio SSR for the Maize Crop -- Appendix 4: Required Water Needed for Crops (million m3) -- References -- Cereal Water Footprint in Arid and Semi-arid Regions: Past, Today and Future -- 1 Introduction -- 1.1 Water Resources Management -- 1.2 Importance of Cereals for Food Security -- 1.3 Importance of Water Footprint -- 2 Arid and Semi-arid Regions -- 3 Water Footprint (WF) Calculation -- 4 Cereal Water Footprint in Past and Today -- 4.1 Cereal Water Footprint in Different Regions of the World -- 4.2 Cereal Water Footprint in Iran -- 4.3 Cereal Water Footprint in Qazvin Plain -- 5 Cereal Water Footprint in the Future -- 5.1 Climate Change Scenarios -- 5.2 Cereal Water Footprint in Different Regions of the World in Future -- 5.3 Maize Water Footprint in Qazvin Plain in Future -- 5.4 Wheat Water Footprint in Qazvin Plain in Future -- 6 Cereal Water Footprint Improvement -- 7 Water Shortage: Management and Consequences -- References -- Environmental Footprints of Hydrogen from Crops -- 1 Introduction -- 2 Overview of the Current Hydrogen Industry -- 3 Hydrogen from Crops: Thermochemical Processes -- 3.1 Steam Reforming -- 3.2 Dry Reforming -- 3.3 Partial Oxidation and Autothermal Reforming -- 3.4 Pyrolysis -- 4 Hydrogen from Crops: Biological Processes -- 5 Electrolysis as an Alternative for Green Hydrogen Production -- 6 Environmental Footprints of Hydrogen Production -- 6.1 Gray, Blue, and Green Hydrogen -- 6.2 Hydrogen from Biomass -- 6.3 Biological Hydrogen -- 7 Conclusions and Key Challenges for a Greener Hydrogen Matrix -- References. , Designing an Energy Use Analysis and Life Cycle Assessment of the Environmental Sustainability of Conservation Agriculture Wheat Farming in Bangladesh -- 1 Introduction -- 2 Materials and Methods -- 2.1 Study Site, Design, and Soil Sampling -- 2.2 Soil Tillage and Agronomic Management Practices -- 2.3 LCA Modeling -- 2.4 Data Analysis -- 3 Results and Discussion -- 3.1 Energy Use Analysis -- 3.2 Energy Indicators in Wheat Farming -- 3.3 Assessment of Life Cycle GHG Emission and Carbon Footprint -- 3.4 Net Life Cycle GHG emission -- 4 Conclusion -- References.