The Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 11 consists of estimates of human population density (number of persons per square kilometer) based on counts consistent with national censuses and population registers, for the years 2000, 2005, 2010, 2015, and 2020. A proportional allocation gridding algorithm, utilizing approximately 13.5 million national and sub-national administrative units, was used to assign population counts to 30 arc-second grid cells.
Nauru faces many economic and environmental challenges. In the 1970s the country experienced an economic boom due to phosphate mining, however, because of mismanagement of the revenue, the country currently has limited financial resources to undertake many of its development programmes including environmentally sound waste management. In the face of a range of environmental, social and economic threats from poor waste management and pollution, and in the context of the limited resources, this National Solid Waste Management Strategy is developed as a matter of priority.