Wanderer

One hundred million years is too long to wander...
After an incredibly long and desolate period of slumber, an Acrocanthosaurus awakens. Instead of being as a zombie or undead, he arises as a phantom: fast, alive, and intelligent, but invisible and unable to affect living matter. He meanders through the world he used to know, not quite sure how to deal with the mammals' inheritance of the earth. Where are all of the trees? Where's his swamp? What happened to all of the sauropods and hadrosaurs that he could attack and feed upon? What is this needle-shaped plant that coveres every square inch of his territory?
What is this world?
Rendered in Photoshop, inspired by the Final Fantasy movies