http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Sách được chia thành bốn chương chính, hai chương đầu giới thiệu khái niệm cơ bản về sinh thái học và bảo vệ môi trường, ô nhiễm không khí và cách bảo vệ môi trường không khí. Hai chương cuối đề cập đến ô nhiễm nước và đất cùng với các loại ô nhiễm khác trong môi trương sống.
Environmental pollution,Environmental protection