Environmentalists are arguing in circles about who or what is to blame: the total number of people; or the amount of water, food, mineral ores or clean air each demands.

环境保护主义者关于人口问题的归责长期唇枪舌剑争论不休：人口总量即与之对应的供给人口需要的水、食物、矿产和清洁的空气总量等等。

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The Toffees have chalked up three straight clean sheets, going a total of 315 minutes - more than six hours - without conceding a goal in the Barclays Premier League.

太妃糖已有3场比赛没有丢球，总共有315分钟，将要超过6个小时没有在英超联赛中丢球。

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Clean, crisp signals are ensured over long cable lengths, decreasing the need for signal Repeaters and saving on total installation costs.

清洁，保证清晰的信号在长距离电缆长度，减少对信号的中继器的需要，对总安装成本节省。

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The total clean-up costs and claims were initially estimated to be around 5tn yen.

BBC: Tepco seeks more aid as Fukushima clean-up costs rise

But Michael Liebreich, the boss of New Energy Finance, expects total investments in clean energy to fall only slightly in 2008, thanks to a strong performance in the first part of the year.

ECONOMIST: Clean technology in the downturn

The 84 million kWh combined solar power will be added to the 40 million kWh of electricity that will be produced by an onsite biogas-powered 5-megawatt fuel cell installation for a total of 124 million kWh of clean onsite power.

FORBES: Apple Data Center to Run Entirely on Clean Energy