I need to change out of the Meta avatar now.I am sick and tired of all these people complaining that green fire doesn't make sense or would look weird. Log off your Warlock and come back when you learn a bit more about their lore. If you already know why green fire exists, yet you still don't appreciate why it's green, please delete your Warlock. You want to chuck around regular fire, then play a fire mage.
Fel fire is not the same fire that exists on the planets. I don't care what the tooltips say; they are just there for the sake of mechanics. Fel fire damage is not fire damage, it is chaos damage. An injury sustained from chaotic fire does not heal. Fel fire is far more powerful than regular fire. Warlocks draw upon the power of the Twisting Nether and harness it in their spells, using it to summon demons, burn enemies, create healthstones, pacts, sacrifices, heals and shields.
The mere fact that Warlocks have been forced to use shadow and flame all this time is insulting. Fire and Shadow have their place, but a Warlock draws his power from the Nether. The energy in the Nether is Fel. Sargeras uses fel energy, Kil'jaeden uses Fel energy, Archimonde used Fel energy, almost every Warlock NPC uses Fel energy. The only ones that are lacking in this department are the players.
Too many are rerolling Warlocks since the revamp and populating the class with clueless people. When the Warlock population was low, it was at least filled with people who appreciated what a Warlock is, why they have what they have and can do what they do. This is one reason why green fire is so sought after, because it is what we should be using. Just because some FotM reroller comes along and 'doesn't get it' that doesn't mean that we are wrong and they are right.
If any of this post rustled your jimmies or hurt your feelings, please, also log off your Warlock. Pet a kitten or something.
TL;DR I hate you. Fire is red/orange/yellow. Fel fire is not that fire. It is something else entirely. It is also green.
EDIT: Maybe this works, unless someone else grabbed it...