Paper Publishing: For papers submitted to CGEEE 2021, after the peer reviewing process by at least 2-3 experts, all the accepted papers will be published into E3S Web of Conferences (Open Access proceedings in Environment, Energy and Earth Sciences), which is indexed by EI Compendex, Scopus,Google Scholar, CAS, DOAJ, CPCI (Web of Science), EBSCO, ProQuest,et al. == Submission and Contact MethodsSubmission Methods: http://confsys.iconf.org/submission/CGEEE2021