The East Siberian Sea is bubbling with methane, a powerful greenhouse gas, being released from underwater reserves, according to a recent expedition.

• 东西伯利亚的海里正冒着甲烷的气泡。近期研究表明，这种被封冻于东西伯利亚永久冻土层中的强烈的温室气体正被释放出来。