Green IT as a tool for design cloud-oriented sustainable learning environment of a higher education institutionTetiana Vakaliuk, Dmitry Antoniuk, Andrii Morozov, Mariia Medvedieva and Mykhailo MedvedievE3S Web Conf., 166 (2020) 10013DOI: https://doi.org/10.1051/e3sconf/202016610013