The major environmental problems are pollution, global warming, ozone layer depletion, acid rain, natural resource depletion, overpopulation, waste disposal, deforestation and loss of biodiversity. We face a wide variety of environmental problems, such as pollution, resource depletion, species extinctions, habitat destruction and climate change. These problems raise many difficult ethical questions. Most ethical theories have assumed that only humans matter. But, should we be concerned with environmental problems only when they harm other humans? Should we be concerned with their effects on non-human organisms? Do we have moral responsibilities towards whole species and ecosystems? This book will survey the ethical dilemmas that environmental problems raise, the attempts to resolve them so far, and the questions that still need to be answered.