Permaculture is an approach to designing sustainable human settlements and agricultural systems by emulating natural ecologies. It was developed in the 1970s in Australia and integrates principles from organic gardening, agroforestry and energy-efficient construction. The goal of permaculture is to create systems that are self-maintaining by maximizing beneficial relationships and minimizing waste through careful observation of natural cycles. It aims to meet human needs for food, shelter and other materials in a way that does not degrade the environment or deplete resources. Permaculture is based on ethics of earth care, people care and fair share and utilizes principles such as observing interactions and harvesting renewable resources sustainably.