School's out, and many people who diligently bike or take the bus to work have bought their plane tickets for vacation. They may not know or care that flying will dramatically increase their carbon footprint. Using a kind of "moral accounting," people who thriftily save fuel getting to work may feel they've done "their fair share" and can indulge themselves in their time off, says a Norwegian study titled, "Troublesome Leisure Travel." This is the unintended side effect of building compact cities, promoting environmental awareness and telecommuting — three of the most common policies for ... Read More