They maintain, as all others have maintained, that discovery gave an exclusive right to extinguish the Indian title of occupancy, either by purchase or by conquest; and gave also a right to such a degree of sovereignty, as the circumstances of the people would allow them to exercise. ... [This loss of native property and sovereignty rights was justified, the Court said, by] the character and religion of its inhabitants ... the superior genius of Europe ... [and] ample compensation to the [Indians] by bestowing on them civilization and Christianity, in exchange for unlimited independence. Population and distribution Indigenous societies range from those who have been significantly exposed to the colonizing or expansionary activities of other societies (such as the Maya peoples of Mexico and Central America) through to those who as yet remain in comparative isolation from any external influence (such as the Sentinelese and Jarawa of the Andaman Islands). Precise estimates for the total population of the world's Indigenous peoples are very difficult to compile, given the difficulties in identification and the variances and inadequacies of available census data. The United Nations estimates that there are over 370 million Indigenous people living in over 70 countries worldwide. This would equate to just fewer than 6% of the total world population. This includes at least 5,000 distinct peoples in over 72 countries. Contemporary distinct Indigenous groups survive in populations ranging from only a few dozen to hundreds of thousands and more. Many Indigenous populations have undergone a dramatic decline and even extinction, and remain threatened in many parts of the world. Some have also been assimilated by other populations or have undergone many other changes. In other cases, Indigenous populations are undergoing a recovery or expansion in numbers. Certain Indigenous societies survive even though they may no longer inhabit their "traditional" lands, owing to migration, relocation, forced resettlement or having been supplanted by other cultural groups. In many other respects, the transformation of culture of Indigenous groups is ongoing, and includes permanent loss of language, loss of lands, encroachment on traditional territories, and disruption in traditional ways of life due to contamination and pollution of waters and lands. Environmental and economic benefits of the Indigenous stewardship of land A WRI report mentions that "tenure-secure" Indigenous lands generates billions and sometimes trillions of dollars' worth of benefits in the form of carbon sequestration, reduced pollution, clean water and more. It