John Harte 
Consider a Spherical Cow [PDF ebook] 
A Course in Environmental Problem Solving

This innovative compendium offers a variety of techniques for approaching contemporary environmental problems. Challenging, real-world situations and worked-out solutions provide the means both for gaining insights into the process of problem solving and for thinking quantitatively and creatively about such environmental concerns as energy and water resources, food production, indoor air pollution, acid rain, and human influences on climate.