For 2050, they expected: * in 1998: 8.9 B * in 2006: 9.2 B * in 2010: 9.3 B * in 2012: 9.6 B * in 2017: 9.8 B That means that they constantly have to revi

For 2050, they expected: * in 1998: 8.9 B * in 2006: 9.2 B * in 2010: 9.3 B * in 2012: 9.6 B * in 2017: 9.8 B That means that they constantly have to revise upwards their scenario because it does not happen as expected and the population grows each time faster. In 20 years, they had to add 1 extra billion people to their forecast...