Landscapes are bound to change if population is growing and demand for housing is increasing and industry and home require food, fodder, and fuel that is obtained from forests legally or illegally. What should be done to prevent biodiversity loss? 

A careful preparation of the biodiversity of an existing area before some development has to start can be done with use of local flora and once a list is prepared the plant associations and ecosystems parameters understood the practice can provide clue to what should come after the development has been completed. Preserve nature for which a person visits hills . It's highly technical work and needs the expertise of taxonomists and botanists and ecologists alike. 
Will  it happen ?