Dallas Fort Worth (DFW) International Airport has reached carbon neutral status partly because the airport converted its fleet to cleaner-burning compressed natural gas (CNG), which has reduced carbon emissions by 25%.

The conversion of the DFW fleet to CNG power has also saved "millions in fuel costs," the airport has announced.

Carbon neutrality occurs when the net carbon dioxide emissions over an entire year reaches zero, meaning the airport absorbs or offsets the same amount of carbon dioxide it produces. The status has been confirmed by the Airport Carbon Accreditation program.

"We recognize that environmental improvement is an economic, social and business imperative for the Airport and for the community we serve," said Jim Crites, executive vice president for operations at DFW Airport. "Sustainability touches everyone and this work helps ensure a brighter tomorrow for our children as well as our Dallas Fort Worth area partners and neighbors."

The airport's sustainability program also involves using renewable energy, fine-tuning building heating and cooling systems to lower energy consumption, using water-conserving plumbing fixtures, adding a reclaimed water delivery system, using super-cooled water rather than air conditioning during peak hours, and implementing a recycling program.

Read the airport's full announcement here.