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Roland Perry · June 4th 13, 08:41 PM posted to uk.transport.london

In message , at 15:34:50 on Tue, 4 Jun
2013, d remarked:
Just for fun I did the calcs for your methane suggestion:

methane it atmosphere = roughly 1.8ppm

A commercial a jet engine takes in roughly 1 ton of air per second (going by
online figures) which for a high bypass turbofan means 100kg of air gets into
the compressor per second.

For a 10 hour flight that'll be 0.1 * 3600 * 10 = 3600 tons of air in
which there'll be 3660000 * .0000018 = 6.6 tons of methane.

Assuming all that methane gets burned (it won't but hey) thats equivalent
to about 165 tons of CO2.

A 747 uses 150,000 litres of kerosene on a 10 hour flight which will create
about 400 tons of CO2 which will be in the atmosphere on average for the next
10K years.

Therefor I think to sum up one can say nice idea, but no cigar.

You appear to have ignored the greater greenhouse effect of methane,
versus Co2.
--
Roland Perry