Editing Biofuel

If we switch every hectare of arable land in Canada (or North America) over to growing the most efficient biofuel crop, we can grow all of the energy we currently use in oil! Exercise A for the reader: Check the facts to make sure that assertion is valid. Google for: * Number of hectares of arable land; * Number of barrels of oil used per year; * Efficiency of oil crops (switchgrass, sawgrass, canola/rape, etc) or corn to ethanol in L/hectare/year * Now get out your slide rule or abacus and do the math. Exercise B for the reader: Once you do, check the facts -- what's wrong with this picture? Or, if you're lazy, you can just read [http://www.i-sis.org.uk/BFOA.php this.]

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This change is a minor edit.

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