Ответить на вопрос по английскому: Who pointed out the importance of keeping our environment clean?

People always feel concerned about the preservation of nature, because they understood that it is important for their lives. If the climate on the Earth become worse it will be more difficult for people. In Russia, the foundations of the scientific approach in the field of nature protection were laid in the second half of the XIX century by such scientists as A. I. Voeykov, D. N. Anuchin, V. V. Dokuchaev, I. p. Borodin.