This booklet is well-suited to the general public and provides a clear and interesting overview of carbon-free nuclear energy. As the James Lovelock writes, nuclear energy is a resource derived from the Earth itself, and is the only viable way to power modern civilization while at the same time avoiding global heating and a new "hot state" for the Earth.
The author shows how vast thorium resources can be used in nuclear reactors; how this process has a great safety record; and the very small amounts of manageable by-products can be stored.
There is also a discussion of several reactor types, including the Pebble Bed Modular Reactor (PBMR). This reactor can be configured to use fuel mixture of uranium and thorium along with a gas coolant (helium, or carbon dioxide, or another inert or semi-inert gas).
The other Amazon critics who wanted a lengthy book may need to realize that the general public will not usually read 100 or 200 page technical journals, and are actually more likely to read Dr. Hargraves book. Hargraves book is also less costly than new hardcovers and it can easily be mailed to Congressional Representatives and Senators. For the Amazon critics who want longer books, such books are readily available from the IAEA for about $25 each. There are long discussions of thorium in the "Megawatts and Megatons" book, an overview of thorium in "Whole Earth Discipline" by Stewart Brand, and a summary in "Power Hungry" by Robert Bryce, . In addition, Pigford has a well written thorium fuel cycle book for about $20.
The PBMR can also be mass-produced in 120 Megawatt modular units, and the PBMR taps into vast thorium energy resources. Even better is the new MIT & UC-Berkeley designed PB-AHTR, which combines the inherent safety of the PBMR design with benefits of using liquid salt as a coolant (providing operation at much lower pressures and far higher efficiency, and a much higher output of Watts per Cubic Meter (W/m3) in the reactor core).
Regarding reactor types I would like to see more analysis of the PBMR, as this reactor is favored by the Department of Energy (DoE) Next Generation Nuclear Program, by Richard A. Muller (in "Physics for Future Presidents") and by Vaclav Smil in "Energy for Beginners". In addition, Vaclav Smil has an excellent discussion about nuclear energy and decides in favor of it in his new book "Energy Myths and Realities".