The need for environmental competence of teachers for rational use of natural resources and environmental protectionSergey Yekimov, Viktoriia Nianko, Irina G. Ershova, Natalya Banko and Dmitriy KucherenkoE3S Web Conf., 291 (2021) 05001DOI: https://doi.org/10.1051/e3sconf/202129105001