When we are talking of human causes, there are a lot of factors that we could mention, however, there are four main reasons we could mention, all together lead to deforestation, being directly or indirectly.
1.- Bad regulation of forest felling, causing massive clearing.
2.-Climate change causes the proliferation of plagues such as the case of Dendroctonus.
3.-Introduction of harmful invasive species.
4.- Land-use change, that is clearing for cattle and human living.