Carpooling decreases the amount of cars used to travel to a place, and cars are a significant source of air pollution. Given these facts, a beneficial effect of carpooling is among the following options:
- animal transport
 - increased water pollution
 - more beneficial emissions
 - reduced air pollution
 - lowered energy cost
 - staying warm
 - lower gas mileage
 - it keeps an organism warm


 

    reduced air pollution     