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  •  Biodiesel is cool, but... (none)
    It can be part of the mix, like solar. But a few questions are in order:

    1. The US produces enough waste greases a year to make 500 million gallons of biodiesel. The U.S. consumes about 131 billion gallons of gas.  So the total biodiesel from this source is something like .3 percent of the total gas used, correct? Meaning it won't replace gasoline, except for a sort of boutique useage.

    2. If the idea is to produce more of the stuff than we now get from waste, the question is this:  farming practices in the US aren't carbon dioxide-free, and aren't environmentally free.  How much CO2 is emitted producing per gallon of biodiesel, via farming practices, etc?  I'm not sure this calculation has been done, but it probably has.

    3. Having entire cities running on biodiesel (were it possible) would be better than regular gasoline engine emissions in many ways. But it would be a lot like mobile McDonald's restaurants and burger kings driving around the city, emitting fat exhaust.  Correct?

    4. My comments aren't meant to knock anything. These are serious questions about realistic ways to prevent global warming. I am all for some use of biodiesel, but it's not the big fix we need.

    Those are my principles, and if you don't like them... well, I have others. Groucho Marx

    by markymarx on Fri May 06, 2005 at 12:08:28 PM PDT

    [ Parent ]

    •  Follow the links I posted! (4.00)
      There's plenty of production capability in the US to supply ALL of our transportation energy.

      ALL of it.

      http://www.unh.edu/p2/biodiesel/article_alge.html

      Read the information I posted about the carbon cycle and biodiesel too.

      No one is saying biodiesel is perfect, but it's pretty goddam close. The thing that makes it really cool is that it's DOABLE. We have the infrastructure, and the technology. If we really wanted to do it, we could be totally free of foreign oil in a few years time, for WAY less than the cost of a couple years of war in the middle east.

      Every [weapon] signifies, in the final sense, a theft from those who hunger and are not fed. - Dwight D. Eisenhower

      by racerx on Fri May 06, 2005 at 12:56:50 PM PDT

      [ Parent ]

    •  No... (none)
      Having entire cities running on biodiesel (were it possible) would be better than regular gasoline engine emissions in many ways. But it would be a lot like mobile McDonald's restaurants and burger kings driving around the city, emitting fat exhaust.  Correct?

      Well, except that there'd be zero net carbon change. All that grease would have decomposed anyway into C02, so burning it's not a big deal.

      The real problem with biodiesel is that it requires a hell of a lot of fertilizer and pesticides to grow any agricultural product in a large-scale sense. Those things are made from oil and natural gas.

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