The carbon-dioxide effect can also change the preferred patterns of atmospheric circulation, which can exacerbate extremes of heat, drought, or rainfall in some regions, while reducing them in others. The problem is that a reduction in those extremes to which we are already well-adapted provides only modest benefits, whereas the new extremes to which we are not adapted can be devastating, as recent events in Pakistan show.
二氧化碳效应同时还会改变大气环流的较佳模式，一方面令某些区域的炎热，干旱和暴雨状况加剧，另一方面却会缓解其它区域的灾情，问题是减轻那些我们已经适应了的极端气候状况只能带来有限的好处，而那些我们未能适应的新极端气候则是灾难性的，正如当前巴基斯坦所经历的那样。