>punching through the ozone layer on a regular basis.  This sort of =
>thing, and the high altitude smog resulting from the engines, will have =
>unintended consequences.  I did not say *might*, I said *will*.=20

Yeah, right. How about looking up the mass of micrometeorites entering the 
atmosphere per day and comparing that to the total mass of fuel to be 
burned up by your vehicles (never mind the burn occurs far *below* the 
layer you are interested in) ? It would be useful to express this mass as 
a percentage.

Peter
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