When we are talking of deforestation, can happen naturally or artificial causes, however, sometimes are hard to distinguish such as plagues and invasive species, the cause can mark the difference between natural cause or artificial, therefore we must be careful with this.
Natural causes:
1.- Natural catastrophes such as tornados or hurricanes
2.-Natural forest fires
3.- Plagues and tree sickness
Human activities:
1.- Bad management of felling trees
2.-Proliferation of plagues increased by global warming
3.-introduction of harmful invasive species
4.-land-use change causing massive clearing for cattle or human-living