You left out the increase in population, and the dispersion of same
from the cities to the spreading suburbs, which increased everything
in your hypothesis of the modern.
On Mar 21, 2009, at 11:43 , Bob W wrote:
One of the benefits of the "horseless carriage" was the
elimination (sic)
of the problem of horse effluent on the streets.
While the total amount of pollution from cars and trucks
today may well
exceed that from horses a century ago that's mostly due to the vast
increase in travel.
That's highly unlikely, even disregarding the fact that the cars
enabled the
increase in travel. Comparing the total amount like that doesn't
really mean
anything anyway. Probably the best way to do it would be by
comparing the
pollution cost of carrying the same loads for the same period of
time - eg
the capacity of a truck for the lifetime of the truck, against the
number of
horses required to carry the same capacity for as long. Bearing in
mind, of
course, that what goes into and comes out of horses is entirely
organic,
sustainable and recyclable, which is not the case with cars. And
also taking
into account the pollution costs of producing what goes in, getting
it to
the consumer (truck or horse), and dealing with what comes out.
Bob
Joseph McAllister
pentax...@mac.com
http://gallery.me.com/jomac
http://web.me.com/jomac/show.me/Blog/Blog.html
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
