1·Early humans seem to have played a major role in finishing offnine other mammal species that weighed over a tonne.
早期人类似乎扮演了终结者的角色，使其他九种超过一吨的哺乳动物彻底从地球上消失。
2·The study showed that a single new desktop machine created emissions of almost half a tonne during its manufacture.
该项研究表明，一个新的台式电脑在其生产过程中要产生近半吨的碳排放量。
3·It does not cost much to scrape it up, and the expense comes in moving costs from mine to market. Even so, Australia can produce iron ore for $25 a tonne.
开采成本本身不高，而且外部投资正在将成本从矿山转移到市场。即便如此，澳大利亚可以以每吨25澳元的价格成本生产铁矿石。
4·By improving their hunting techniques, early humans seem to have played a major role in finishing off the woolly mammoths and nine other mammal species that weighed over a tonne.
利用改进了的狩猎技术，早期人类似乎扮演了终结者的角色，使长毛猛犸和其他九种超过一吨的哺乳动物彻底从地球上消失。
5·The best study on the footprint of home computers was carried out by Apple; it showed that a single new desktop machine created emissions of almost half a tonne during its manufacture.
苹果公司对家用电脑的碳足迹曾做过最佳的研究；该项研究表明，一个新的台式电脑在其生产过程中要产生近半吨的碳排放量。