DeKorne described his attempts to become self-sufficient in food production because of widespread predictions of energy shortages and ecological collapse. He used windmills to generate energy and tried to set up a mini-ecosystem of rabbits, fish, and plants in his hydroponic greenhouse. Twenty years later, he ruefully admits that warnings of global famine did not quite come true, that windmills are an impractical source of energy in most parts of the United States, and that aquaculture did not live up to its promise as a cheap source of protein. In this revised edition of that book, he concentrates on maximizing greenhouse plant production, devoting chapters to alternative energy sources; control of temperature, light, and carbon dioxide in the greenhouse; hydroponics; and practical aquaculture. This book would be an excellent companion to basic guides to hydroponics or organic greenhouse management; anyone interested in energy-saving alternatives to traditional gardening will find this a delight.