https://www.post-gazette.com/news/environment/2010/12/13/Program-encourages-Steelers-tailgaters-to-recycle/stories/201012130226
https://www.wm.com/sustainability-services/documents/insights/Stadiums%20and%20Arenas%20Insight.pdf
https://www.forbes.com/sites/uhenergy/2017/12/11/big-sports-events-have-big-environmental-footprints-could-social-licenses-to-operate-help/#22d7a2fc50cf
https://www.onyalife.com/eco-friendly-products/
https://www.eia.gov/energyexplained/index.php?page=gasoline_environment
