Receding Horizons for Alternative Energy Supplies

My latest column on Scitizen entitled "Receding Horizons for Alternative Energy Supplies" has now been posted. Here is the teaser:

When oil optimists tout the huge supply of oil that is still available to us in the form of tar sands and oil shale, they forget to mention that costs are rising so quickly for producing that oil that these alternative sources may prove to be of limited value. The same cost problems are occurring in the renewable energy field as well. What is behind this phenomenon sometimes referred to as the problem of receding horizons?...Read more