One of the best ways to ensure sustainability is through lowering the operating costs, especially for energy. They can install solar panels on the roofing of their terminals to generate enough energy to power its facilities. Another way to boost efficiency is by building LEED-certified buildings; this way, they can preserve the environment while boosting passenger services. CLE should also consider alternative fuel for its shuttles and other machinery to help lower their carbon emissions and achieve carbon neutrality. The use of electric vehicles has made it easy for airports to offset their carbon emissions.