… specific foci on sustainable packaging, circular economy business models, and industrial symbiosis. He is a student co-leader of the Center for Business & Environment at Yale (CBEY) … specific foci on sustainable packaging, circular economy business models, and industrial symbiosis. He is a student co-leader of the Center for Business & Environment at Yale (CBEY) … specific foci on sustainable packaging, circular economy business models, and industrial symbiosis. He is a student co-leader of the Center for Business & Environment at Yale (CBEY) …