Synopsis The Earth has enough resources to generate electrical energy for several billion years! How does it sound? Unbelievable; especially in the light of growing debate over issues like depleting source of fossil fuel and its adverse effect on environment. Well, believable , this book says. The amazing technologies discussed in the book prove beyond doubt that it indeed can be done. Fuel cells, geothermal energy and tidal energy are practically inexhaustible sources of energy. Take, for example, a case of tidal energy. Tides are caused by the gravity of moon. And this gravitational pull is not likely to diminish for billions of years! Or, take an example of geothermal energy that uses heat trapped in the depth of earth. One estimate predicts that if properly harnessed, this source will provide us energy for coming 30,000 years! Not exactly inexhaustible, but certainly for quite long! The first section of this intriguing book discusses the fuel cell technology; the second section discusses geothermal energy and the third section talks about tidal energy. Carefully selected articles lucidly take readers through these promising sources of alternative energy.