sentences:  Later, following the 1973 and 1979 energy crises, there was significant media coverage on the subject of oil supply levels.This brought to light the concern that oil is a limited resource that will eventually run out, at least as an economically viable energy source.Although at the time the most common and popular predictions were quite dire, a period of increased production and reduced demand in the following years caused an oil glut in the 1980s.