About WCEESD2019 2019 4th World Congress on Energy, Environment and Sustainable Development (WCEESD2019) (http://www.wceesd.org/2019/en/home) is a platform for academic communications between specialists and scholars in the fields related to energy, environment and sustainable development. WCEESD2019 will be held in Nanjing, China during Aug. 12-14, 2019. Nanjing is the capital of Jiangsu province and the second largest city in eastern China (after Shanghai). Publication 2019 4th World Congress on Energy, Environment and Sustainable Development (WCEESD2019) accepts original and unpublished papers. Both Full paper and Abstract are welcomed. Full papers accepted by the conference will be published online in the following journals of Science Publishing Group (http://www.sciencepublishinggroup.com). The journals have been indexed and abstracted by WorldCat, CrossRef, Electronic Journals Library, CNKI, Zeitschriftendatenbank, EZB, ResearchBib, Polish Scholarly Bibliography, Wissenschaftszentrum Berlin, etc. International Journal of Economy, Energy and Environment (IJEEE) http://www.sciencepublishinggroup.com/j/ijeee ISSN Print: 2575-5013 ISSN Online: 2575-5021 International Journal of Oil, Gas and Coal Engineering (OGCE) http://www.sciencepublishinggroup.com/j/ogce ISSN Print: 2376-7669 ISSN Online: 2376-7677 Science Journal of Energy Engineering (SJEE) http://www.sciencepublishinggroup.com/j/sjee ISSN Print: 2376-810X ISSN Online: 2376-8126 International Journal of Environmental Monitoring and Analysis (IJEMA) http://www.sciencepublishinggroup.com/j/ijema ISSN Print: 2328-7659 ISSN Online: 2328-7667