|The Happy Planet Index (HPI) is the leading global measure of sustainable well-being.
The HPI measures what matters: the extent to which countries deliver long, happy, sustainable lives for the people that live in them. The Index uses global data on life expectancy, experienced well-being and Ecological Footprint to calculate this.
The index is an efficiency measure, it ranks countries on how many long and happy lives they produce per unit of environmental input.
The 2012 HPI report ranks 151 countries and is the third time the index has been published.