例句：
The correlation of carbon dioxide with temperature, of course, does not establish whether changes in atmospheric composition caused the warming and cooling trends or were caused by their.
杨鹏的解释：
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例句里面最后面的were caused by their 的their 指代不是很清楚，甚至觉得their用的不对。 而杨鹏的解释竟然是 changes in atmospheric composition were casused by their changes（自己由他自己导致！）. 怎么看题意都是在说不确定是大气结构变化和气温变热还是变冷的趋势谁是因谁是果的关系吧！！