> > 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"?
> 
> There is no contest, just put both in their own garage, close the door
> and wait.
> ---
> But more on topic, would you count the CO2 from the driver of the
> Hummer as well? :-)

Insignificant.  After all, the energy required to move a Hummer 1 mile
(over, say, 3 minutes) would take several hours for a human sitting
behind the wheel to burn.  If not longer.

It's a fun thought experiment, though.  And more to the point, it can
reveal a flaw in thinking.  One of the favorite arguing points of those
who favor large vehicles is that emission standards are now such
that 1 gallon of gas in a Chevy Cavalier and one gallon of gas in a
Ford Excursion produce roughly the same waste products, so why
not drive the Excursion?

Never mind the fact that you'll use 3 times the petrol...But then,
who ever claimed people are logical?

Mike H.
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