On Sun, 09 Jul 2006 22:15:00 -0700, Roy Lewallen wrote
in :

You're right that the antennas used to receive beamed power will catch
only half of it at best. But many, many business plans have been
developed and billions in stock sold for schemes which are much less
plausible. For starters, how about the current idea of hydrogen "fuel",
"made from water"? (For those not acquainted with the harsh reality of
thermodynamics, it takes more energy to extract hydrogen from water than
you'll get back when you burn it. Charlatans notwithstanding, there's
just flat no way around this little fact.) Then there's SDI. . .

The point of hydrogen is a means of energy storage and transmission, not
power generation. Typically the hydrogen will be released from water by
solar or nuclear power. See:
http://en.wikipedia.org/wiki/Hydrogen_economy
http://auto.howstuffworks.com/hydrogen-economy.htm
http://www.aip.org/pt/vol-57/iss-12/p39.html

--
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