Greening The Sports Industry Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Citi Field, April 2009. Citi Field has an 11,000-square-foot green roof and 65,000-square-feet of porous pavement, which mitigates storm water runoff. ( Ffooter / Shutterstock ) Produced by PRI and WNYC