In Melanesia, the Tambu (also spelled Taboo or Tapu) system offers a powerful, time-tested model for sustainable living. These systems govern access to places or resources based on cultural or spiritual customs. For example, a reef might be closed to fishing following the death of a chief, remaining off-limits during a period of mourning and cultural protocol, and only reopened either to prepare for the funeral feast or after it has taken place. The result? Fish populations have time to recover and replenish.