My heart was pounding. Would we emerge into the open and find the polar air again?

我的心在跳动。我们是要浮起来，找到南极的自由空气吗？

Some talk of geoengineering—for example, spraying sulphates into the polar air to reflect sunlight back into space, or using salt to seed the creation of sunlight-blocking clouds.

有些人谈到地球工程，比方说向极地大气中喷洒硫酸盐，从而将阳光反射回太空，或是撒盐来促使水汽凝结成云，阻挡日光。