这种正式名为一氧化二氮的气体对臭氧层所构成的威胁，可能很快就会超过氟氯烃(CFC)化学品。而后者自上世纪八十年代以来就已被限制使用。

The gas, properly known as nitrous oxide, could soon pose a bigger threat to ozone than CFC chemicals, the use of which has been restricted since the 1980s.

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例如，全球变暖可能导致有毒化学品更具挥发性，也因此更易于在风中广泛散播；而将二氧化碳注入地下岩层以抑制气温上升的做法，很可能会造成蓄水层的酸值上升。

For example, global warming could cause toxic chemicals to become more volatile, and so more prone to dispersing widely in the wind.

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教授布拉·奇利：除了使用氯，那里也有过氧化物的化学品，这就是他们通常添加的。

Prof. BLATCHLEY: So there are peroxide chemicals that are used in addition to chlorine, and that's usually how they're added.

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