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

Fact 2: Cars and gasoline-burning engines are large sources of emissions.

Given the two facts above, answer the question "What can help decrease emissions?" with the following options: 
- power
 - exercise
 - Carpooling
 - Flying on airplanes
 - Having children
 - Eating red meat
 - green manures
 - electricity


 

   Carpooling      