By increasing ridership on public transit, more fuel is conserved, air pollution decreases, and the region’s carbon footprint is reduced.
Public transportation inherently benefits the environment because it reduces the number of people driving single occupancy vehicles.  By increasing ridership on public transit, more fuel is conserved, air pollution decreases, and the region’s carbon footprint is reduced.  The cleaner air resulting from increased public transportation ridership benefits the entire region, not just those who use it.