By JESSICA GUERRERO MORELIA, Michoacán —  The overexploitation of soil in Mexico’s wester central state of Michoacán, caused by the cultivation of avocados, has produced drastic effects on the environment and the endemic ecosystems of that state. Mexico is the center of global avocado production, specifically the central region of the country. Today, at least 135,000 hectares of Michoacán — Mexico’s