Before we get to the looming Tesla funding crisis, let’s notice that the web still isn’t living up to its reputation. Given all the agencies and organizations dying to inform you about global warming, it’s almost maddening that one piece of data is unavailable: how much of the global emissions “problem” is caused by cars and light trucks that consumers buy.

Take the Union of Concerned Scientists. It’s happy to tell you: “Our personal vehicles are a major cause of global warming. Collectively, cars and trucks account for nearly...