Religion and Conservation Philosophy

Given the recent field course in Sikkim and our exposure to varied religions, it is interesting to note the debate about the increasing world population as seen from a Buddhist perspective (http://www.guardian.co.uk/commentisfree/belief/2011/oct/31/population-growth-buddhist-reincarnation). Buddhists apparently do not believe that reincarnation is a matter of 'one out -one in' where which a permanent  'soul' persists but prefer to talk in terms of rebirth.