Deforestation to heat lodges are devastating Nepal.中的Deforestation to heat lodges 是甚么意思?

问题描述:

Deforestation to heat lodges are devastating Nepal.中的Deforestation to heat lodges 是甚么意思?
这句话的主语是甚么?为什么用are

以滥伐森林(得到的木材)来为小屋/旅社供暖
主语就是Deforestation,我也觉得好像要用is = =
例句:
Deforestation in the humid tropics is probably the best-known current example of rapid land-use change.
在湿润的热带采伐森林,是当前迅速利用土地最显著的例子.
里头就用is来着~