In the Disney/Pixar film Wall-E, we see space junk practically covering Earth's atmosphere in orbit... how? If it had been years, generations even, since man had been to Earth, shouldn't all of that debris eventually have fallen back to Earth? Thus Earth's atmosphere should be clear of ANYTHING? (The surface and oceans would be a royal mess, but above should be crystal clear I would think?)
Is this something I'm missing in orbital (in-universe) physics, or is this question better to just chalk up to the "it's a cartoon, it looked cool to Pixar" position?
See the inserted picture to see what I mean.
And a view from far away