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Maps & Information

Today is Monday December 01, 2008

How Much Land for a Biofueled City?
Analysis & Commentary: "Land for Biofuel"
(to calculate: click curser on, then off, yellow input cell)

  population of city
  population density (people per square mile)
  water use per day per person (gallons)
  water use per year per person (gallons)
  residential water use of city (million gal./year)
  total residential water use of city (acre feet)
  total land area of city (square miles)
   
  miles driven per person per year (average)
  average miles per gallon
  auto fuel req'd per year (million gal.)
42   gallons per barrel
  barrels auto fuel required per year
   
  barrels of oil per square mile crop per year
  square miles of biofuel crops required
   
  ratio: irrigation gallons to fuel gallons
  irrigation water req'd for biofuel (million gal.)
  total acre feet req'd for biofuel crop
  ratio: water for biofuel vs. households
  ratio: land for biofuel vs. households



How to use this calculator:

(1) It is sometimes necessary to click on one of the yellow input cells, then click somewhere else on the screen in order to prompt the interactive spreadsheet to calculate and display results.

(2) Yellow cells are input cells - you may enter your own assumptions in these cells.

(3) When you refresh the screen, the original default assumptions will reappear in the yellow input cells.
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