The San Diego International Airport joins the ranks of only ten airports in the U.S. today.
The Airports Council International certified the San Diego airport as Level 3, a rare ranking, in its attempts to decrease its carbon footprint.
"The San Diego Airport initiated what is known as the 'Good Traveler' Program," said Dennis Probst, vice president of development for the San Diego International Airport. "It allows passengers to purchase carbon credits. That is helping fund planting trees and other things that consume carbon."
The San Diego airport also made strides in reducing carbon emissions by encouraging airlines to switch to plant-based biofuels.
According to the website Blue Sky Model, on average, a plane produces over 53 pounds of carbon dioxide per mile.
"The largest amount of carbon consumed at an airport is on the aircraft," Probst added.
In addition, all vehicles on the runway and buses use electric or alternative fuel. The airport terminals also utilize solar energy.
The airport hopes to become completely carbon neutral by 2022.