Not all coal seams need fracking to make gas flow .

并非所有的煤层都必须用水力压裂法采气。

Already , some companies are looking beyond coal seams to the gas revolution 's next stage .

一些企业目前已开始寻找煤层气以外的项目，开启燃气革命的新阶段。

Thanks to surging demand in asia , the gas trapped in coal seams is the next frontier .

由于亚洲的燃气需求激增，煤层蕴藏的燃气将成为开采的新领域。

These are gas resources trapped in dense rock , coal seams , in layers of shale , or at shallow depths .

这些天然气资源存在于致密岩中，煤层夹缝中，页岩的岩层中，或者在浅层。

Chemical evidence also revealed a sharp up-tick in atmospheric carbon at the time , possibly spewed into the atmosphere when lava infiltrated and cooked pre-existing coal seams .

化学证据揭示了在那一时段内大气中碳含量发生急剧上升，或许就是因为熔岩渗入并引燃煤层后大量碳进入大气导致的。