Achieving Sustainability: Visions, Principles, and Practices cover Alternative Energy cover Encyclopedia of Environmental Ethics and Philosophy cover Environmental Encyclopedia, ed. 4 cover Environmental Issues: Essential Primary Sources cover UXL Encyclopedia of Biomes, ed. 2 cover UXL Encyclopedia of Landforms and Other Geologic Features cover UXL Encyclopedia of Water Science cover UXL Encyclopedia of Weather and Natural Disasters, ed. 2 cover UXL Encyclopedia of Weather and Natural Disasters cover Water: Science and Issues cover