> The argument was that, after the higher grade hydrocarbon stores are > exhausted, there is no available terrestrial energy source available > that produces more energy than it consumes in its production. If you include sun energy into the equation this statement is an obvious truth. If you exclude sun energy it is obviously false, otherwise no life would exist on earth. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist