Kazan first-graders talked about ecology today. Specialists from the Ministry of Ecology and Natural Resources of the Republic of Tatarstan conducted an eco-lesson “Planet Earth” in gymnasium No. 122 in Kazan. “Our planet is a house, a house for a mouse and a crane, a worm and a butterfly, a pine tree and a lily of the valley”, began her story a Specialist of the Ministry, Leysan Faizullina.