Conservation ethics: one or many

Should there be a single unified conservation ethic?
Does one exist already?

Would it help conservation?

Robinson et al 2010 argue for pluralism, as does Sandbrook et al 2010, though Matt Child 2010 calls for a Thoreauvian ethic. But isn’t there something that unites all those who favor conservation and differentiates them from those who don’t? Something along the lines of regard for nature and reasonable treatment of it. Could something as basic as this recognition, appreciation and commitment to the maintenance of nature be considered a conservation ethic? With the right words and marketing could it help transmit the idea of conservation?