Hawai‘i’s environmental equilibrium has ebbed and flowed since humans arrived in the islands about 1,000 years ago. Those first Polynesians developed the land division system called ahupua‘a—chiefdoms had access to all they needed, from mountain to sea, with the community stewarding the natural resources. While some ecosystems were displaced to make way for agriculture, the land continued to support a population of up to 800,000 sustainably for centuries.