Ecological problems of modern central Kazakhstan: challenges and possible solutionsТurgai Alimbaev, Zhanna Mazhitova, Bibizhamal Omarova, Bekzhan Kamzayev and Kuralai AtanakovaE3S Web Conf., 157 (2020) 03018DOI: https://doi.org/10.1051/e3sconf/202015703018