"In tribal cultures usufruct means the land is owned in common by the tribe, but families and individuals have the right to use certain plots of land. Most Indian tribes owned things like land as a group and not as individuals. The family never owned the land, they just farmed it. This is called usufruct land ownership. A person must make (more or less) continuous use of the item or else he loses ownership rights. This is usually referred to as "possession property" or "usufruct." Thus, in this usufruct system, absentee ownership is illegitimate."
"The HPI is an innovative measure that shows the ecological efficiency with which human well-being is delivered around the world. It is the first ever index to combine environmental impact with well-being to measure the environmental efficiency with which country by country, people live long and happy lives. The second compilation of the global HPI, published in July 2009, shows that we are still far from achieving sustainable well-being and puts forward a vision of what we need to do to get there."