In the last 200 years more than half of the forests in Australia have been cleared. Some of this has been for farms, some for timber or wood chipping, and some to make room for pine plantations. None of these uses provide food or homes for native animals.
When trees are cut down erosion by rain or wind takes place. This is because there are no strong roots to hold the soil. Without soil, plants cannot grow so the land can never again be used as a habitat for animals.
Native vegetation has been killed by mining or because of flooding due to the damming of rivers for irrigation, drinking water or the generation of electricity.