; (4) to protect and maintain biological and native species diversity and dispersal throughout the Northern Rockies Bioregion; (5) to promote and ensure interagency cooperation in the implementation of integrated, holistic ecosystem management and protection of the ecosystems and corridors covered by this Act based on principles from conservation biology; (6) to preserve scenic, historic, and cultural resources; (7) to promote scientific research, primitive recreation, solitude, physical and mental challenges, and inspiration for the benefit of the people of the United States; (8) to avoid the misinvestment of scarce capital in land of marginal timber value; and (9) to promote ecologically and economically sustainable management in the Northern Rockies Bioregion. 4. Definitions In this Act: (1) Corridor The term corridor means an area that provides connectivity of habitat or potential habitat, and that facilitates the ability of terrestrial, estuarine, and freshwater fish, or wildlife, to move within a landscape— (A) as needed for migration, gene flow, or dispersal; or (B) in response to the impacts of climate change or other impacts. (2) Development (A) In general The term development means an activity that eliminates the roadless and wilderness characteristics of the land on which the activity takes place. (B) Inclusions The term development includes the construction or operation of a ski resort facility, road building, timber harvesting, mining, and oil and gas drilling. (3) Greater ecosystem The term greater ecosystem , when used in conjunction with a specific ecosystem described in this Act, means an ecological land unit— (A) (i) of sufficient scale to support and maintain populations of large vertebrate species and the other native plant and animal species of the unit; and (ii) comprised of land that is similar in topography, climate, and plant and animal species on the land