Environmental ethics is a study setting the moral norms of between humans and the nature that where human are belonging, and exploring the possibility and feasibility of it. There are two main environmental ethnics view of the nature: intrinsic vs. extrinsic. J. Baird Callicott, an environmental philosopher, says in "Environmental Philosophy is Environmental Activism" that nature is intrinsically valuable, which means that it has own right to be sake. So, the human-centered moral norm of human society is wrong, so we should change the norm and the attitude towards natural objects such as killing or wasting, which will lead to overcome ecological crisis that we are facing (11-16). On the other hand, another environmental philosopher, Andrew
