There are many ways and means to forecast population of which system Dynamics is the one, system Dynamics has many advantages of solving the problem on complex system.

用于人口预测的方法很多，系统动力学仿真便是其中的一种，该方法在解决复杂系统问题时具有多方面的优势。

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THOMAS MALTHUS first published his “Essay on the Principle of Population”, in which he forecast that population growth would outstrip the world’s food supply, in 1798.

托马斯马尔萨斯在1798年首次发表的《人口论》中, 他预测, 人口的的增长将超越世界粮食供应能力.

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Japan's declining birth rate means that by 2015 more than one in four Japanese will be 65 or over, while the working population is forecast to shrink almost 10 per cent by 2030.

日本出生率的不断下降意味着，到2015年，四分之一以上的日本人口将超过65岁，到2030年，日本工作人口预计将减少近10%。

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"Our overarching recommendation is that funding arrangements in London should allow London government to make additional self-determined investments in its own infrastructure both to cater for the growth already forecast for its population and economy, and to promote additional economic growth, " the report says.

BBC: London

The urban population of the world is forecast to grow to 6.3 billion people in 2050 from 3.4 billion in 2009, representing both population growth and net migration from countryside to city.

UNESCO: CULTURE

The forecast is that the working age population (15 to 64 years old) will decline by almost half to 44 million.

FORBES: Japan's Demographic and Cultural Destiny