<P> The 2012 UN projections show a continued increase in population in the near future with a steady decline in population growth rate; the global population is expected to reach between 8.3 and 10.9 billion by 2050 . 2003 UN Population Division population projections for the year 2150 range between 3.2 and 24.8 billion . One of many independent mathematical models supports the lower estimate, while a 2014 estimate forecasts between 9.3 and 12.6 billion in 2100, and continued growth thereafter . Some analysts have questioned the sustainability of further world population growth, highlighting the growing pressures on the environment, global food supplies, and energy resources . </P> <P> Estimates on the total number of humans who have ever lived range in the order of 106 to 108 billion . </P> <Table> <Tr> <Th_colspan="5"> World population (millions, UN estimates) </Th> </Tr> <Tr> <Th> #</Th> <Th> Top ten most populous countries </Th> <Th> 2000 </Th> <Th> 2015 </Th> <Th> 2030 * </Th> </Tr> <Tr> <Td> </Td> <Td> China * </Td> <Td> 1,270 </Td> <Td> 1,376 </Td> <Td> 1,416 </Td> </Tr> <Tr> <Td> </Td> <Td> India </Td> <Td> 1,053 </Td> <Td> 1,311 </Td> <Td> 1,528 </Td> </Tr> <Tr> <Td> </Td> <Td> United States </Td> <Td> 283 </Td> <Td> 322 </Td> <Td> 356 </Td> </Tr> <Tr> <Td> </Td> <Td> Indonesia </Td> <Td> 212 </Td> <Td> 258 </Td> <Td> 295 </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Brazil </Td> <Td> 176 </Td> <Td> 208 </Td> <Td> 229 </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Pakistan </Td> <Td> 138 </Td> <Td> 189 </Td> <Td> 245 </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Nigeria </Td> <Td> 123 </Td> <Td> 182 </Td> <Td> 263 </Td> </Tr> <Tr> <Td> 8 </Td> <Td> Bangladesh </Td> <Td> 131 </Td> <Td> 161 </Td> <Td> 186 </Td> </Tr> <Tr> <Td> 9 </Td> <Td> Russia </Td> <Td> 146 </Td> <Td> 146 </Td> <Td> 149 </Td> </Tr> <Tr> <Td> 10 </Td> <Td> Mexico </Td> <Td> 103 </Td> <Td> 127 </Td> <Td> 148 </Td> </Tr> <Tr> <Td> </Td> <Td> World total </Td> <Td> 6,127 </Td> <Td> 7,349 </Td> <Td> 8,501 </Td> </Tr> <Tr> <Td_colspan="5"> Notes: <Ul> <Li> China = excludes Hong Kong and Macau </Li> <Li> 2030 = Medium variant </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th_colspan="5"> World population (millions, UN estimates) </Th> </Tr>

A graph of world population growth over the past 500 years
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