The Delhi sultans were interested in cutting down the forests for many reason like they wanted to speed up their movement of their army which moves for wars and even some other reason. They wanted to even speed up and even bring more and more agricultural products so they cut down the forests for this purpose also.
No, in our time the deforestation is done for other reasons like for trading purpose, for wood, for even the natural minerals like coal, charcoal etc. But yet the process of deforestation i.e. cutting down the forests didn't change.