Kev wrote:
I don't understand why it is greener to walk?

http://newsvote.bbc.co.uk/1/hi/sci/tech/5390418.stm

Do they stop running the tubes or buses if enough people decided to
walk. I can't see how this helps the environment.


Directly: the train/bus doesn't need to use energy to accelerate 80kg
of you every time it speeds up, nor to raise 80kg of you up any hills
it may climb.

Indirectly: if enough people decide to walk, the number of passengers
on the bus route/tube line will be lower, and therefore fewer costly
and resource-intensive expansion schemes will be required (it might
also be possible to cut frequencies and hence the total number of
services).

--
John Band
john at johnband dot org
www.johnband.org