he human appetite. Wild fish catches are declining, and many of us seek to avoid the guilt brought on by eating unsustainable seafood. 3M. Bateson, D. Nettle, & G. Roberts, “Cues of being watched enhance cooperation in a real-world setting,” Biol. Lett. 2:3, 412-14 (2006). “D. M. T. Fessler, “Shame in two