Energy can never be depleted. The same amount of energy that was present in the beginning is still present today.
When we believe something has vanished it is merely an illusion of smoke and mirrors. We have you paying attention to this one thing over here, so you don’t see what is coming in over here.
Problems rise, but seem to vanish when we complete a solution. And every problem has a solution. Worry not, my friends. Nothing ever vanishes.