Juan F. Velasco-Muñoz, is an assistant professor in the Department of Applied Economics at the University of Almería, Spain. He is a member of the research group "Environmental and Natural Resources Economics". His research is focused on the sustainable management of resources, especially natural resources, socio-economic valuation of ecosystem services, and development of circular economy systems. Dr. Velasco-Muñoz has numerous publications on these topics in peer-reviewed journals, as well as book chapters, and contributions to conferences. In addition, he is the editor of several scientific monographs, he directs several doctoral theses on resource management and circular economy and he has been Guest Editor of the Special Issue Sustainability journal ‘Environmental Economics. Contributions to Sustainability of Agricultural Ecosystems’. Chaudhery Mustansar Hussain is an adjunct professor and lab director in the Department of Chemistry & Environmental Sciences at the New Jersey Institute of Technology (NJIT), United States. His research is focused on sustainability, nanotechnology & advanced materials, environmental management, analytical chemistry, and other various industries. Dr. Hussain is the author of numerous papers in peer-reviewed journals as well as a prolific author and editor of several books, including scientific monographs and handbooks in his research areas. He has published with ELSEVIER, American Chemical Society, Royal Society of Chemistry, John Wiley & Sons, CRC Press, and Springer.