This conference has two modalities of participation: Physical-onsite or Virtual-online

The Onsite-Online 2021 International Conference on Green Energy and Enviromental Technology (GEET-21) is organized by academics and researchers belonging to different scientific areas of the University Complutense of Madrid, University Carlos III of Madrid, University of Extremadura and University of Las Palmas de Gran Canaria with the technical support of Sciknowledge European Conferences.