> One day I will wake up and realize that it's not the millions of cars
> on the roads thats causing the trouble, its the liberal tree-hugging
> hippies that ride bikes and exhale more CO2 that causes all of the
> problems. Do the world a favor and buy a Hummer.

That does pose an interesting question, though:

Does the average gasoline joule contribute more CO2 than the
average burned food joule?

I'm not talking about overall, here; ignore the CO2 costs of getting
the food to grow, the CO2 fixed by plants before they are harvested,
etc.  Let's make it more specific:  Does an H2 release more or less
CO2 per joule used than a human does?

In other words, start a Hummer, drive it one mile, turn it off.  Measure
the output of CO2 and the amount of energy required to do so.  Now
put a person on a bicycle, at a reasonable pace, and measure CO2
output versus energy usage.  Who "wins"?

Of course, the person on the bike will go many, many more miles
than the H2 did, but that's not the question...

Mike H.
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