This course serves as an introduction to the goal of sustainability and the ethical issues regarding our environment, i.e. the natural world and the non-human entities in it. We will begin by analyzing the justifications for sustainable policies and lifestyles. Then we will focus on issues raised by the various ways sustainability might be achieved: increasing the efficiency of our resource use, slowing or reversing population growth, and slowing or reversing economic growth. Questions asked and discussed will include, but are not limited to: What role does the environment play in human well-being? How should we go about making environmental policy decisions? How should animal suffering affect the way we treat non-human animals? What obligations, if any, do we have toward non-human animals, plants and/or eco-systems? Students are expected to have a comprehensive ethical understanding of environmental issues through these questions.