This article sure sounds foolish. As I see it, the main driver in the increase in "growth" (other than population) is productivity. Productivity tends to be driven by gradual adoptions of automation, which has been a major factor for 50+ years, and actually far larger. Automation isn't going away, and will only increase in effectiveness for decades
Energy is a factor, but society is well on its way to the widespread adoption of solar and wind energy. Solar is useful in most locations, and wind will eventually be useable just about everywhere, 24 hours per day, with the use of low-resistance materials to conduct that energy, for example metallic carbon nanotubes. (MCNTs).