life is outgrowing the planet, maybe dinosaur were just nature taking control killing off the thing that is burning her up.
No, no, you've got it all wrong. The dinosaurs were not burning up the earth. THIS creature was responsible. After "burning her up", it framed the dinosaurs, whom Mother Nature killed, and managed to escape. It is also the starter of the forest fires which still plague us today.

(Wanted, Dead or Alive - Reward: The Gratitude of Fire-Fighters Everywhere)
As for our future size... this man assures me he is a 47-year-old from the future. I believe his picture will answer your question.

- Gehn