I received the copy of the old book I mentioned, the Energy Primer (Richard Merrill, Thomas Gage) and sure enough it is one of the most complete texts that I have seen on the relationship of Energy and Us. Wind, water, wood, solar, agriculture, alcohol - they are all covered....and, this was in the late 70's, with most subjects STILL looking pretty up to date. One of the interesting facts is our relationship with food. Not everyone can chop wood behind their house or afford $4,000 solar panels or a new hybrid - but it turns out that Food is responsible for 12-15% of our energy use! More importantly, if we ate different foods, those numbers could be cut in 1/3 or more. Surely a way that everyone can help the energy situation. The book explains that we actually eat only the equiv of 30 gallons of fuel each a year (in calories), BUT to produce this food cost about 10X as much. That is because we waste most of our food energy. Take a look at the enclosed charts - notice the amount of protein or energy required to produce various foodstuffs. Eating American beef is the equiv. of turning in your 20 dollar bills for a one dollar bill - a pretty bad payback! This book was really the main impetus for my entering the energy business in the late 70's. It is rare to find a text that puts it all together and shows the science behind each renewable energy subject.