Okay, so once upon a time, I sat through a lecture or two on The Lord of the Rings and the Inklings in general. One of the concepts I really took away from there was that in order to create a good book you need three things. First, you need to inspire a love of the world. Second, you need a catastrophe. Third, you need a eucatastrophe, or a catastrophe for good (get it? because Tolkien was a linguist, so he played fast and loose with the English language and was wont to slap things like "eu-" onto words).
So step one is obviously building a world that people will become invested in, that they will want to see preserved because there's something special about it. So I took our world and found a catastrophe... specifically some truly horrible episodes of Heroes. Now yes, they were painful to watch, but they got me thinking. I asked myself, "What if these random people with elemental powers evolved into something more? What if they became living incarnations of the element they were associated with?" So I thought this over. Maybe they would feel compelled to overthrow the civilization that tore the earth asunder, drank her blood and reshaped her bones. Maybe they wouldn't be so cool with the way mankind enslaved lightning and chained fire for their own benefit and comfort. Maybe water and wind should be paid a little homage, being necessary for life and all.
And thus began the War of the Elements. Oh man, let me tell you, it was epic. Earth awakening when he got pushed off that building, Wind manipulating Fire into blowing up that oil tanker to secure her aid, and all of them coming together to bust Lightning out of that cell where the government was milking him for electricity. And then their offensive, it was... oh, wait, I haven't actually written any of that yet. Basically, I came up with this story and realized that an urban fantasy adventure wasn't something I was comfortable writing just yet. But sci-fi, now that was a different story. I mean, I was triple majoring in math, physics, and chemistry for a little while back in the day, until I decided that I'd rather graduate than spend 60 hours in lab a week. Psuedo-science I could do. So I jumped forward by about five hundred years.