Luxuries are those things that would be nice to have if costless. Necessities are those things we must have regardless. 2.I like the caribou as much as the next person. And I would be rather sorry if their mating patterns were disturbed. But you can’t have your cake and eat it too. 3. But we must remember that not every species is needed to keep that diversity. Sometimes aesthetic aspects of life have to be sacrificed to more fundamental ones. 4.Nature is our ward, not our master. It is to be respected and even cultivated.