==**Ei Ccompendex and Scopus**== ★Full Name: 2021 The 4th International Conference on Renewable Energy and Environment Engineering(REEE 2021)--Scopus, Ei Compendex ★Abbreviation: REEE 2021 ★Date: August 27-30, 2021 | ★Place: Florence, Italy ★Website: http://www.reee.net ==Publication: **All accepted (Registered & Presented) papers of REEE 2021 will be collected in the E3S conference proceedings (eISSN: 2267-1242), which is indexed by *Scopus*, *Ei Compendex*, Google Scholar, CAS, DOAJ, EBSCO, ProQuest, etc. **Special Issue-Energies(ISSN 1996-1073) Prize for the best full paper will be the publication of 1 (one) paper in Special Issue in Energies (ISSN 1996-1073; CODEN: ENERGA).--Impact Factor: 2.702 (2019) ;5-Year Impact Factor: 2.822 (2019) ==History: REEE 2018 proceedings are published online (E3S Web of Conferences,Volume 80,2019),indexed by Ei Compendex & Scopus already. REEE 2019 proceedings are published online (E3S Web of Conferences,Volume 122,2019),indexed by Ei Compendex & Scopus already. REEE 2020 proceedings are published online (E3S Web of Conferences,Volume 191,2020),indexed by Ei Compendex & Scopus already. ==Committee: Conference Chair: Prof. Elmar Bollin, Offenburg University of Applied Sciences, Germany Program Chairs: Prof. Muhammad Shakeel Virk, University of Troms?, Norway; Prof. Carlos Felgueiras, Polytechcnic of Porto, Portugal. Local Chair: Prof. Nidia Caetano, Polytechcnic of Porto, Portugal Guest editors: Prof. Jorge Loredo, University of Oviedo, Spain; Prof. Jin Su Jeong,Universidad de Extremadura, Spain. For more information about committee, please visit http://reee.net/committees.html ==Topic Scope (include but not limited ) Biofuels / Biofuel Cells Hybrid Energy Systems Hydropower Solar Energy Wind Energy Nuclear Energy Fission & Fussion Energy Policy, Planning & Management Energy Conservation Energy Conversion Fuel Cell Technology Renewable Energy Sources Solar Energy Water Energy Wind Energy Wastewater and Sludge Treatment Drinking Water treatment Energy Efficiency Water Treatment and Reclamation Industrial Wastewater treatment Wetlands for Wastewater Treatment Ecosystem Restoration Hazardous Gas Biofiltration Soil Restoration/ Phytoremediation Environmental Process Simulation Data Management and Statistics Environmental Remote Sensing Applications GIS for Environmental Assessment Air Quality Assessment Ecosystems Assessment Water Resources and Quality Assessment Water Pollution and Water Quality Control ==Contact: Melanie Li Xiao E-mail: reee_conf@vip.163.com Tel: +86-1348-2222-225