Yale Environment 360: For the past few years, an acrimonious debate has been ranging between two camps of conservationists. One faction advocates protecting nature for its intrinsic value. The other claims that if the degradation of the natural world is to be halted, natures fundamental value -- in other words, what nature can do for us -- needs to be stressed. The tone of the rhetoric has Joy Leighton Jane Lubchenco led to a petition, published this month in the journal Nature, that criticizes both sides for indulging...