The Chicago Department of Aviation (CDA) has implemented numerous airport industry-leading initiatives to improve natural resource conservation, operational efficiency, social responsibility and economic viability at O’Hare and Midway International Airports. The CDA continues to seek creative ways to reduce emissions and energy use, conserve water and natural resources, salvage and recycle materials, reduce waste, and educate passengers and the local community.​​​​​​​

​ ​​