The department of Environmental Conservation estimates the optimum population at 60.

环境保护部估计最适宜的年龄是60岁。

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But set all that alongside some LSE research last year for the Optimum Population Trust.

把那些放一边，伦敦交易证劵所最近调查的可能是信赖的优化的人口。

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Having set the optimum population number for planet earth, the World Planners have also set a date by which to achieve their optimum population number.

为地球设定了最佳人口数目，该世界计划者们还设定了一个在该时间之前实现其最佳人口数目的日期。

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The study by Mr Wire was commissioned by the Optimum Population Trust, a British environmental charity.

ECONOMIST: Fewer people would mean lower greenhouse-gas emissions

The Optimum Population Trust goes further with proposals that government encourage couples to stop at two children and the introduction of a one-in one-out policy on immigration.

BBC: England and Wales population up

Britain's Optimum Population Trust offered summit attendees an opportunity to offset the estimated 1.1 tons of carbon emissions released into the atmosphere from their trans-Atlantic flights by donating money to a family planning program.

FORBES: Magazine Article