The happy planet index is an index of human wellbeing and environmental impact that was introduced by the new economics foundation. The index is designed up challenge the well-established indices of countries development, such as gross domestic product, human development index and quality of life index. Furthermore, it is believed that the notion of sustainable development requires a measure of environment costs in pursuing happiness and health. On this index Costa Rica was ranked the highest in HPI, and Zimbabwe was ranked the lowest in HPI.