Even in the Three Thousand worlds it took quite some time before the monsters and beast and other races to have their own method of refining and purifying the energy of the world
And Earth itself would have more and more "pollution" in the heaven and earth energy
This is something that could not be stopped. The more people there is, the more the energy would be changed by it
But pureness alone does not mean it would be good. The more diversity to the energy, the more path one could reach and the more one could innovate.
Pure energy is good for destructive and creation power. But because it is pure, some people could not practice certain method
Being "polluted" in energy is not the same as the context of polluting that most people in this world understood.
Everyone knows polluting rivers and the sea is not good. But the context of "polluting" energy is different
