The largest source of CO2 emissions in the United States now officially comes from vehicles, and much of that can be blamed on the daily commute.
Rush-hour traffic approaching the Oakland-San Francisco Bay Bridge.
Americans spend an average of 26.9 minutes driving each way to work, and most of them (76 percent) are traveling alone. That means roughly 115 million vehicles are on the road every day.
That daily commute generates a massive amount of air pollution, which contributes to poor air quality and climate change, not to mention the daily traffic jams that make that journey just a little bit