Comics Are No Place For Science...?

-MY RANTING INVOLVES ELEMENTS BROUGHT TO THE GREEN LANTERN-VERSE FROM THE LAST STORY, LIGHTS OUT. STOP IF WISH NOT TO KNOW THE CONCEPT-
>
>
>
>
>
>
So, in a book that has different alien species harnessing emotions as energy based weapons, should I really be this baffled by the science of it? At this point in the game? In the latest story, a villain from before the current creation, called Relic (nice, subtle name), comes in claiming that he must stop the emotions from being used because it turns out that all the energy being used is from a "reservoir" that they are depleting and once it's out, existence ends. Here's where I for some reason can't stop with the science: energy cannot be destroyed so... how are they using it all? I get that the "well" could become dry, but in the idea that they are using energy from emotions, how is that energy being destroyed? How did it get filled to begin with? The storyline ended with Kyle Rayner, with all the Entities of each emotion (sans Fear but with Life. How the shit did Life just die?!) sacrificing himself to refill that "reservoir". Only he came back out and the Entities stayed to die and do it (they killed Life?!). So... emotion can refill it? Or better yet, since energy can't be destroyed, why can't somebody like Firestorm change something over into energy they can use? Then again, the "reservoir" is contained behind the Source Wall, so it's pretty convenient that the energy can be drained out from it, but nothing can go back in... I don't understand how not one Lantern from any of the factions can remember that energy can't be created or destroyed.
Or maybe I'm suddenly thinking too much into it. I'm probably thinking too much into it.