So, Japan's per capita energy use is already half that of the United States. Half. And that's the energy consumption of one of the world's richest, most technologically advanced nations. That stat should make us ashamed of ourselves. But this might be even more impressive: in the aftermath of the nuclear crisis, Japanese citizens have cooperated to help save electricity. In the process, they've reduced energy usage by 15% in Tokyo, one of the world's most electric cities. The New York Times explains how they did it.