Perhaps they are talking about using bio-degradable/compostable plates, napkins, silverware, cups, etc.
I get these request from time to time, however, they never referred to it as "green bbq."
Peace and Smoke,
My Weapons: Custom rig - Kandi, UDS; Bubba Keg; 22.5 WSM x 2; 18.5 WSM; BWS extended party; BWS Gator and an Onyx Oven; 29' ft Coachmen Leprechaun (Lola).
Dan Chambers get well soon, so we can tell you to "Shut up Chambers"