What it didn't mention is we're almost at the peak amount of Natural Gas we can get out of the ground... From here on out it will be increasingly more expensive to get the last bits out.... same as oil, except we're suppose to be hitting the oil peak a little sooner (estimates are anywhere from this year to 15 years away, but the peak is coming).
I don't know if I swallow all of this, but here's something to scare the shit outta ya....
http://www.lifeaftertheoilcrash.net/