The increased price of energy and exhaustion of good - quality fuel reserves mean it is currently more profitable to use lower - quality fuels. (environmentalleader.com)
The low price of energy is unsustainable because conventional petroleum is running out and because we are burning so much fossil fuel that we are damaging the atmosphere (climate change). (ramblingsdc.net)
Inflation appears to have moderated since earlier in the year as prices of energy and some commodities have declined from their peaks. (alephblog.com)