For papers submitted to CGEE 2021, we offer the publications as following: Submissions will be reviewed both by the conference technical committees, and accepted papers will be published in E3S Web of Conferences (Open Access proceedings in Environment, Energy and Earth Sciences), which will be indexed by EI Compendex, Scopus, Google Scholar, CAS, DOAJ, CPCI (Web of Science), EBSCO, ProQuest, etc. A set of selected papers with extended version will be published into Journal of Clean Energy Technologies, which will be indexed by Inspec, Electronic Journals Library, Chemical Abstracts Services (CAS), Ulrich's Periodicals Directory, Google Scholar, ProQuest.