In my global warming kick, I was amazed to discover that for each gallon of gasoline my car burns, it produces 20 pounds of carbon dioxide. Thus, my commute produces 280 pounds of CO2 every week. That’s 14,000 pounds a year: over 6 metric tons! Put another way, my car produces its own weight in carbon dioxide every three months!

There’s something to think about the next time you’re stuck in rush hour traffic.