Nuclear scientist Question:

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We are vastly more energy efficient than we were just a few decades ago, much less a few centuries ago. Yet, even as we’ve become more efficient, we’ve also continued to use more energy. That’s because energy efficiency makes energy cheaper, and the result is that we find more ways to use it. Just a few years ago, nobody had heard of the cloud, and two decades ago nobody had heard of the Internet. Today, more of us than ever are able fly around the world. We fill our homes with 50-inch televisions and all manner of networked devices. We transform billboards and skyscrapers into gigantic LED video screens. Efficiency is good and we should strive for more, but it won’t eliminate the need to develop enormous quantities of cheap and zero carbon energy to meet the demands of the growing global economy.