ecocide
From Longman Dictionary of Contemporary Englishecocidee‧co‧cide /ˈiːkəʊsaɪd $ ˈiːkoʊ-/ noun [uncountable] the gradual destruction of a large area of land, including all of the plants, animals etc living there, because of the effects of human activities such as cutting down trees, using pesticides etc SYN ecological genocide