We had slash and burn agriculture; people cannot afford the fertilizer, so they burn the trees and have the minerals available there; the fires become more frequent, and after a while you're stuck with an area of land where there is no fertility left.
我们使用火耕； 人们买不起化肥 所以他们燃烧一半的树木与当地现有一半的矿产。 火灾变得经常发生 过一阵子你又被困在一块 完全无法耕种的土地上。