Dangerous Times As Energy Sources Get Costlier To Extract - Forbes: "the industry’s capital expenditures for oil and gas have grown by about 12% annually over the last decade. Oil and gas production grew less than 2% a year in the same period. Clearly the more money and resources needed to maintain adequate production of oil and gas, the less money and resources available for other endeavors.
...the more general concept of resource return on investment, or RROI, would probably find the U.S. in a lot worse shape than as measured only by EROI, or the amount of energy required to get more energy."
