In previous decades pollution, soil depletion, the destruction of the ozonelayer and an imminent ice age were the ecological catastrophes that faced us.
经过过去几十年的污染，土壤贫化、臭氧层破坏和即将到来的冰川时代是我们要面临的生态灾难。
2
Nitrogen oxides releases directly by supersonic aircraft into the stratosphere contribute directly to the depletionof the ozonelayer.
由超音速飞机直接排放到平流层中的氧化氮会直接导致臭氧的消耗。
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'It (the Protocol) has protected the stratospheric ozonelayer from much higher levels ofdepletion by phasing out production and consumption of ozone depleting substances,' said the report.