And,this constant movement of population also affects the humanitarian workers as it makes the planning and the delivery of aid much more difficult because we cannot predict where the people are going or if they are coming back."

VOA: standard.2009.06.21

The Chinese government's population-planning commission forecasts another 100m rural residents could move to cities by 2020.

ECONOMIST: The impact of Chinese migration: We like to move it move it | The

Population-planning officials embarked on a 20-day campaign to complete a quota of 9, 559 sterilizations, by consent or by force.

FORBES

The National Population and Family Planning Commission estimates the population will peak in 2033, when there will be 1.5 billion Chinese.

FORBES: China's New Census: The Ancient Country Is Growing Old