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註釋The series draws material from the massive Bershire Encyclopedia of Sustainability to provide slender and inexpensive volumes focusing on specific topics for teachers and students. The 33 articles here examine benefits people obtain from nature, which are called ecosystem services for people who cannot think outside the framework of commerce. The topics include air pollution indicators and monitoring, fish, glaciers, medicinal plants, nutrient and biogeochemical cycling, permaculture, plant-animal interaction, true cost economics, and wetlands.