他们不需要压缩电站和成千上万吨油。升级之后，设备维护费用降低了4倍。
They do not need compressor stations and dozens of tons of oil. After upgrading the cost of equipment maintenance has decreased 4 times.
他们得出的结论是如果计划得到实施，那么吸收1吨二氧化碳的费用为40美元---这一数字听起来便宜得有些让人尴尬，而作为初步价格，Kruger博士并不准备对外宣扬。
They concluded that if put to use they might lock up carbon dioxide for $40 a tonne—which seems almost embarrassingly cheap, and which, as a preliminary figure, Mr Kruger is keen not to hype.
欧盟规定，只有每年碳排放量低于1万吨的航空公司，才可以免收这笔费用。
The European Commission's carbon tax plan will only exempt airplanes that have an annual carbon emission of less than 10 thousand tons.
它们除了是“钱”以外没有任何其它意义：仅2008年一年纳税人为此支付的成本费用就达到8亿4800万美元，其中超过2/3的花费用于铸造硬币上，铸币生产过程中要消耗14823吨的锌、23879吨的铜、2514吨的镍。
And that ain't money for nothing: The cost to taxpayers in 2008 alone was $848 million, more than two-thirds of which was spent minting coins that many people regard as a nuisance.
一棵树在它的有生之年能吸收一吨的二氧化碳。树荫也能减少十到百分之十五的冷气费用。
A single tree will absorb one ton of carbon dioxide over its lifetime. Shade provided by trees can also reduce your air conditioning bill by 10 to 15%.
一棵树在它的有生之年能吸收一吨的二氧化碳。树荫也能减少十到百分之十五的冷气费用。
A single tree will absorb one ton of carbon dioxide over its lifetime. Shade provided by trees can also reduce your air conditioning bill by 10 to 15%.
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