Today, with more efficient technology, we no longer blast into outer space in the same way.

In 1923, before construction was even complete, a more efficient technology for burning coal was developed, rendering the plant obsolete before it even opened.

Improvements in energy efficiency are most often achieved by adopting an efficient technology or production process.

Soil-protection, energy and resources savings, and ecologically efficient technology are other areas of study.

Production, which peaked at 48 million barrels in 1968, fell by 1990 to less than 20 million, and highly efficient technology significantly reduced employment.