> Um.  I don't think that making Aluminum Oxide out of
> Aluminum is any less "destroying" the Aluminum than making
> CO2 and H2O out of a hydrocarbon is "destroying" the
> hydrocarbon.  Of course, the CO2 tends to be allowed to
> drift away, while the Al2O3 is a nice solid

That fact does make the Al process more eco-friendly. It could
mean that a spent Al cartridge can be exchanged for a new one

HC combustion is inherently dirty - COx, NOx, particulates. It
would take some effort to stop all of that coming out as exhaust

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