High levels of methane gas have raised fears of further explosions and hindered rescue efforts.

高浓度甲烷增加了后续发生爆炸的危险性，也对救援工作造成了妨碍。

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She talked to EarthSky about the high concentrations of methane gas she discovered in oil plumes deep beneath the surface of the Gulf.

她告诉EarthSky，深海处的原油层已经产生了高浓度的甲烷气体。

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So far, Jackson's results are consistent: What's in peoples' Wells is deep gas, created in high heat with its own chemical signature. It's not like the methane in this old seep.

目前，Jackson的结论仍然不变：水井中的是地下深处高热生成的甲烷，有自己的化学特征，与常年渗漏的沼气不一样。

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Dinosaur wind contained a high proportion of methane gas - powerful enough to damage the ozone layer, said the China Youth Daily quoting a French scientist.

BBC: Ill wind 'killed dinosaurs'

But critics of shale gas point to environmental concerns such as high water use and possible water contamination, the release of methane and, to a lesser extent, earth tremors caused by drilling.

BBC: US oil production 'to jump by a quarter by 2014'