Mongabay: To protect natural ecosystems in the long term, some conservationists advocate "land sparing," in which farmers intensify agricultural practices to boost yields, theoretically enabling them to forgo expansion into natural areas. Others advocate "land sharing," in which farmers take over more land but use low-intensity, more environmentally friendly agricultural practices. High-intensity practices on land-sparing farms, such as heavy planting, grazing, and use of fertilizer and pesticides, can threaten...