Late to the game but I have a theory on the state of magma energy I've been forming in my head since the last episode:
Spoiler for Magma Energy, Earth and Klaxosaurs:
So here is my theory on Magma Energy: obviously, it's not magma as we know it. My theory is that Earth is some sort of giant life form, like a Gaia, and that Magma Energy is it's blood. The healthier the planet is, the healthier the enviroment is on the surface. Usually, I'm assuming, Earth feeds the eco-system indirectly through the fertility of the soil or something like that.
Then APE came along and literally started sucking out the lifeblood of the planet to extend their own lives. Magma energy is literally life energy and the more they drained from the planet, the more the surface became more desert like,
What does that make Klaxosaurs? I think they are serving as an immune system for the planet. Either they were a package deal with Earth and always have been there or they are ancient humans/another species that learned how to live peaceably with the planet. When Earth began dying, they came into action in response to stop it.