Of all the forms of oil we're aware of, palm oil is the cheapest to obtain and supply. That makes demand for it extremely high and provides an incentive to those countries who can supply it to create as much as possible. Indonesia is one such nation, and in response to elevated demand, their Government has opted to increase palm oil production by forty million tons by the end of the year 2020.
The most efficient way to do that is to cut down areas of rainforest and turn them into palm oil plantations. This is an incredibly short-sighted and selfish move. Trees provide us with oxygen. We literally need them in order to carry on breathing. Aside from that, the forests play host to hundreds of different kinds of flora and fauna, all of which have been displaced and many of which have died due to the loss of their natural habitat. Orangutans, who in evolutionary terms are cousins of humanity, are one of the species under threat.