The clearing of forests for agriculture or logging is progressing at a worrisome rate around the world.
全球，为农垦或木材而清除森林的行为正以令人担忧的速度进行着。
That means any efforts aimed at limiting greenhouse gas concentrations will have to be even more stringent in reducing the burning of fossil fuels, clearing of forests and the like.
这意味着任何限制温室气体浓度的措施将不得不变得更加严厉，例如减少化石燃料的燃烧、避免砍伐森林等。
The researchers blamed farming and the clearing of forests for much of the damage. Rural areas are not the only ones losing soil. Land is also being affected in cities and near mines and factories.
研究者把大部分损害归咎于农业和砍伐森林，但是农村地区不是流失土地的唯一地区，在城市里、矿场和工厂附近土地也受到影响。
Early farmers started clearing forests and livestock produced a lot of extra methane.
早期的农民开始砍伐森林，牲畜产生了大量额外的甲烷。
Clearing tropical forests for agriculture is estimated to produce 17% of the world's greenhouse gas emissions - more than the global transport system.
砍伐热带森林转型农业生产这种行径，预计所产生的温室气体将占全球排放量的17%——这超过了全球整个交通系统的排放量。
Land clearing and overlogging of forests have been highlighted as the greatest threats to land-based flora and fauna in the Oceania region, according to a review of 24, 000 scientific papers.
一份以24000篇科学论文为基础的报告称，拓荒以及森林的过度砍伐已经成为大洋洲地区陆生动植物群的最大威胁。
Fire was used initially for warmth, light, and cooking; later it was used in fire drives in hunting and warfare, and for clearing forests of underbrush to facilitate hunting.
火的最早用途是取暖、烹调，后来才用于狩猎和作战，以及为了捕猎而清除下层丛林。
Fire was used initially for warmth, light, and cooking; later it was used in fire drives in hunting and warfare, and for clearing forests of underbrush to facilitate hunting.
火的最早用途是取暖、烹调，后来才用于狩猎和作战，以及为了捕猎而清除下层丛林。
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