by shortonoil » Sun 28 Oct 2007, 17:59:12
Starvid said:
$this->bbcode_second_pass_quote('', 'Y')our argument does not make sense. It's not hard to imagine a situation where you would still increase oil extraction levels or make liquid fuels, even if the EROI of doing it went negative.
I was a little reticent to post this because I suspected that some one would bring up this very issue, which I would then have to defend:
First: you can not have a negative ERoEI. ERoEI is a ratio; ER/EI, neither energy returned, or energy invested can be negative, there is no negative energy (outside of theoretical discussions in physics and Star Trek movies).
Second: if you have a situation where you extract oil at an energy loss to provide liquid fuel, you are inputting energy into the process. Such as converting hydro, NG, nuclear or coal into oil by subsidizing the process with energy from those sources. This is impractical as you loose energy in the process (The Second Law). It would be more efficient, therefore more economical, to produce synfuel directly from the coal or NG. If you were insistent on pursuing such a program you would soon be out of business as your competitors could always under price you. Of course we have examples of energy loosing products being produced, like ethanol, where the government subsides the farmers and producers. This is only possible because the funds originate from (still) energy delivering oil.