Adjectives can be tricky
When Shari showed me this label I had misgivings about dinner tonight.
Actually right now the car is a zero emission vehicle because it is parked in the garage. Tomorrow, when Shari drives to Toms River, it will go back to being a vehicle with emissions that amount to a positive number. You don't get to average that number with zero and come out with a section of zero so you can feel better about your carbon footprint.