Fact 1: Carpooling decreases the amount of cars used to travel to a place.

Fact 2: Cars are a significant source of air pollution.

Given the two facts above, answer the question "A beneficial effect of carpooling is" with 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     