As they’ve guided China’s remarkable economic ascent over the last four decades, the country’s leaders have largely been content to focus on raising incomes and building factories. They’ve steered clear of messy international entanglements that could undermine economic progress, and with it the public support that keeps them in power. Over the past decade, of course, a richer, more confident …

Most of us remember the time before smartphones were in the pockets and purses of billions of people. Before those gadgets became the primary computer for millions of people. Before the smartphone boom made fortunes for some companies — Apple and Facebook, for example — and doomed others. That all happened in less than a decade. That is stunningly quick. …

Per-capita electricity use peaked in the US in 2007. With the exception of a post-recession rebound in 2010, it has declined every year since. I already wrote a column about this epochal shift last month, but the chart that went with it is so remarkable that I’m going to recycle it here. What caused the decline? I offered several possible …