Reading Time: 3 minutesEvery Thursday I load up my cat in my bike basket and ride to the farmers market for some fresh produce. I use the afternoon to bake bok choy cookies for my drum circle, needless to say they are a big hit. This particular Thursday, I was riding home, a bike basket full of strange vegetables, when from behind, a diesel dually rolled past. The driver stomped the pedal and immediately engulfed me and my cat in a thick cloud of black smoke. Later my therapist informed me that “Rolling Coal” is what they call it, and diesels are not actually supposed to function like that.    Don’t Blame the Diesel Many people see this type of behavior and assume that diesel engines are extremely dirty and spew black smoke at will. This is not the case, you may only notice the trucks egregiously spewing black smoke, but the majority of diesels on the road are operating properly with barely a puff from the exhaust pipe. In reality, modern diesel fuel is highly refined to make it burn clean, and with