Fire & Water & Earth & Air

So there is this girl.
She can walk through fire and not get burned. Nor does she need anything artificial to keep her warm.

So there is this boy.
He does not need to come up for air. Nor does he need solid ground to walk.

So there is this girl.
She can make things grow from nothing. And shaking the ground everyone stands on is not impossible for her either.

So there is this boy.
He can blow down the leaves from the trees before it's their time. And cooling everything down on a hot summer day is still within the realm of his possibilities.

Now, what happens when a force rises against humanity?

These four will have to come together and do the impossible.