This is a very interesting link. Note that the strongest decline in energy intensity in the disaggregated graph at the bottom is in transportation. That certain

This is a very interesting link. Note that the strongest decline in energy intensity in the disaggregated graph at the bottom is in transportation. That certainly speaks for efficiency as an explanation. As for the growth story, well. The ordinary person 10 years ago didn't have a smart phone. That's a pretty significant impact on our way of life. Whether it actually improves the quality of our lives is a different question.