SOCIAL SCIENCES
(3) 4-6 Science Concepts series. This is a good discussion of some of the factors controlling global warming. The authors describe, in considerable detail, various biological and geological cycles that are known to affect our climate and make clear some of the difficulties in considering these quantitatively. Well-placed and -captioned photographs and diagrams, as well as informative sidebars, enhance the volume. Reading list, websites. Glos., ind.

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