by Hagakure_Leofman » Sun 11 May 2008, 11:20:14
$this->bbcode_second_pass_quote('', 'S')o can we? And if not, then why not?
No, we can't replace oil with renewables. Mainly because of the law of diminishing returns. Oil is an energy source. It packs a punch. We use it for a vast array of applications. Especially in transport and agriculture. There isn't another energy
source like oil. People talk about hydrogen, but that takes energy to make, as there aren't hydrogen wells waiting around to be tapped. In other words, you need a fossil fuel economy just to make hydrogen in the first place. And you loose net energy in the process of making it, so it's no solution.
Regarding wind, solar etc, they create electricity, but you can't easily transport electricity, or make it available as easy energy for transportation vehicles. Then people talk about hydrogen fuel cells, but again, all of these proposals assume an oil economy to manufacture, and create these energy 'containers'.
In other words, oil is a massively potent
source of energy. So far, we've been able to extract it from the ground using less energy than the energy we retrieved. The problem we now face, is that it's taking more and more
energy to retrieve what oil remains, and soon it won't even make sense to try and retrieve it, since we'll be expending more energy than we'll get back from what we pump.
That's the trouble with the so called replacements. They take energy to build, generate, maintain and store. All of these things reduce the energy we're ultimately left with, proving them no replacement for our oil economies. The balance sheet doesn't add up. We always end up with less energy than before.
I've just touched on the issue.
For a better description, try Richard Heinburg's good book, The Party is Over. Or Kunstler's The Long Emergency. There are many other books and DVDs that explain it better than I could.