Construction is an extreme case in point, largely because it takes several months to build a house.
相关情况中建筑是一个比较极端的例子，很大程度上是因为建一栋房子需要几个月的时间。
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Part of the increase stems from human activities—directly, in the case of construction, or indirectly, when it results from clearing vegetation from marginal land in order to farm it.
Part of the increase stems from human activities-directly, in the case of construction, or indirectly, when it results from clearing vegetation from marginal land in order to farm it.