Oceans: How We Use the Seasby Dana Desonie
Earth's seas play a tremendous role in the planet's systems: Ocean currents transfer water and heat around the globe, and ocean ecosystems are among the most biologically productive anywhere. But the oceans are being abused. Wild fisheries are harvested to the point of collapse, and some aquaculture damages both sea life and the environment. People intentionally or inadvertently dump wastes-sewage, oil, toxic chemicals, detergents, and fertilizers-as well as invasive species into the seas; and all have an impact on ocean ecosystems. Offering full-color photographs and illustrations and captivating text. Oceans introduces young science students to these urgent issues. This important new book shows how protecting the oceans requires protecting the entire planet and describes the necessity of establishing marine reserves to save vital ecosystems.
Gr 9 Up- Focusing in great detail on overexploitation of natural resources, these utilitarian books will be valuable resources for science reports. In Biosphere , "The Sixth Extinction" section is its most useful. A table lists five previous mass events, after which the factors contributing to today's conditions (loss of habitat, pollution, climate change, overharvesting, and invasive species) are methodically outlined with accompanying statistics. The color diagrams, maps, and photographs (some of which are upsetting) are few but effective. The second book opens with an overview of the world's oceans, then discusses marine resources, the effects of pollution and other human activities (overfishing, habitat destruction), and the future of these natural resources. The introductory material is available elsewhere, and overall the work is more textbooklike than photograph-rich volumes such as the Smithsonian Institution and National Oceanic and Atmospheric Administration's Hidden Depths (Collins, 2007). Still, libraries that need detail on the toll that increased human activity takes on the oceans will find the discussions and statistics useful. Both books include quotes from reliable sources such as the academic journals Nature and Science , and the further-reading lists (Biosphere 's is more thorough) also include citations from these resources, as well as from popular publications.-Henrietta Thornton , School Library Journal
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