"This guide presents extensive data on the habitats and ecosystems of more than 1,200 species identified as endangered or threatened by the US Fish and Wildlife service...

Contains topical essays on topic areas such as atmosphere and oceanography, ecology, engineering and technology, geomorphology, and human activities related to the coasts...

An interdisciplinary, online, wiki-based encyclopedia "about the Earth, its natural environments, and their interaction with society...

Encyclopedia is a series of chapter-sized articles that cover very broad topics...

"The Encyclopedia of Environmental Ethics and Philosophy addresses the needs of upper high school students, undergraduate researchers, teachers and professors, as well as general readers by examining the philosophical and ethical issues underlying contemporary and historical environmental issues, policies, and debates...

Around 300 articles on "all types of phenomena that change life on Earth...

Aims to become a comprehensive, authenticated source of information about the world’s biodiversity freely available over the Internet...

"Provides in-depth, worldwide coverage of environmental issues...

Contains descriptions of more than 2,500 endangered species, habitats, and ecosystems in this unique guide to little-known, protected sites across the United States...