Facing desperate shortages of energy, water, clean air, food. . . ? ""Earth scientists to the rescue!"" is the call trumpeted in this optimistic roll call of present and future challenges such as using underground nuclear explosions to find and release fossil fuels; the Magma Tap that could provide unlimited thermal energy; long term weather prediction and control; and saving our atmosphere from those aerosol-propelled chlorine atoms. Millard outlines the technology, not for assessment, but for inspiration to future earth scientists, and his breakdown of specialties within the field (petroleum geologists, mineralogists, geochemists, etc.)--with some idea of what is the difference between the work of, say, an agronomist and a horticulturalist--will no doubt be the most useful feature here. There is very little help offered the student who might be wondering whether he is suited to the fields; a liking for the out-of-doors is the chief prerequisite for most of these careers, according to Millard, though a Ph.D. helps. With a realistic assessment of prospects for non-college technicians, some comments from earth scientists themselves, and a fairly extensive bibliography, this might be more useful than other entries in this series, but there's still a definite aura of salesmanship.