为了生产更多的天然气——得到更多的收入——能源公司采取了创造性的措施，竭尽全力从天然气井里钻探出最后一点天然气。
To generate more of it—and more income—energy companies are resorting to creative measures, eking out every last bit from the gas wells they drill.
而因为没有人在意去查究，天然气整个生产周期(也就是说，从天然气井中直到使用它的地点)中的排放量却不太明确。
Less clear, largely because no one has bothered to look, are the emissions over its entire production life cycle - that is, from the moment a well is plumbed to the point at which the gas is used.
页岩气所排放的温室气体主要有两类：燃烧产生的二氧化碳以及页岩气井开采过程中的甲烷泄漏。
Greenhouse gas emissions from shale gas are predominantly down to two things: carbon dioxide produced when the gas is burned, and methane that leaks out while the well is being exploited.
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