Well, if the images have a semblance of canon, between this one and the one with the trio looking at a cat near a railroad with tufts of grass around, it's seems that effectively, the world isn't nearly as fucked as Q made us thought, and that the "core-ified" landscape happened in a limited area.
Which would also means that Kaworu was an huge dick in not telling this to Shinji, "mass extinction" my ass!
That would also explain why Asuka told to Shinji that he was a naive brat when he claimed he will save the world with the spears : the world actually don't need any saving or repair, or at least no marginally more than after 2I, so no need to play with fire and touch these doomsday devices that are Evangelions and magic alien spears! Which for her proves that Shinji was completely misled by neo-NERV and SEELE, and an utter moron.
Shinji's gonna be on quite a shock when they get out of the red desert and stumble upon hills covered in grass and a gigantic magnificent Lilin base/city! He'll also probably punch Kaworu in the face if they ever meet again like he told him they will in Q!
Ah, I'm not the only one to thought of Kaji then, must be the large shirt and relaxed stance.