If water pollution is ever to stop, people will have to stop polluting the water--an aspect of the problem that is largely ignored here. Instead we have an extended look at a dirty river, a visit to a plant reating water for human consumption (irrespective of the extent of pollution), a second visit to a sewage treatment plant (sewage undefined), and much generalized bemoaning without precise indication of cause and effect. None of this is much to look at, and most of the processes can't be seen by the two touring children, which makes the pictures largely incidental (they're intrinsically unattractive). The only solid information is on the mechanics of purifying water before consumption and removing wastes after (a connection which is not acknowledged). Consider the book primarily a routine alert, and look elsewhere for solutions.