Tom,

Lets say:

1 lbs per mile
5000 miles per car per year
tree weight 1660 lbs [1]
700 trees per acre [2]

hope I have the right number of zeros ! ! !
1,000,000 cars x 5,000 miles = 5,000,000,000 lbs

5,000,000,000 / 1660 = 3,012,048 trees per year

3,012,048 trees / 700 = 4302.9 acres per year


[1] <http://www.spiritone.com/~brucem/savetree.htm>
[2] <http://wiki.answers.com/Q/How_many_trees_in_an_acre>

Jeff




On Sun, 2010-11-07 at 08:25 -0800, Tom Miles wrote:
> What was the impact of a million gasogenes on the forest of Europe
> during the war? Has anyone seen any estimates?
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