Christian Science Monitor: Driving less? More than two-thirds of car owners already are. It’s a natural reflex to $50-$70 tank fill-ups. But US drivers may also know it’s time to pay a price to curb global warming. That may be one reason they reject the campaign stunt of urging a holiday for the federal gas tax. US politicians can’t have it both ways. Most seek the type of solutions for climate change that would raise energy costs, yet they are now trying to prevent the very kind of high pump prices that help …