If I spend 20 years accumulating baseballs, and then go out and drop them all in a baseball field full of people over the course of about 4 days, and all those people really want baseballs for some reason, will it take 1825 days for them to pick all the baseballs up?
I'm sorry, that has no relationship whatsoever to the subject. I could take it apart piece by piece. Still, it would be an exercise in futility.
Here's one that might highlight the nature of the problem:
Imagine you burn a cubic meter of wood at the base of a building with twenty floor. All internal doors and stairs are open, so the smoke and gasses can go everywhere. Particles can travel into cracks, air ducts, all kinds of places and land.
A few hours later the fire is out.
Now go and remove all gasses dispersed through the building and recover every particle deposited on every surface across twenty floors.
First. It's impossible.
Second. If you really wanted to attempt such a feat, it would require more energy and resources --by orders of magnitude-- than what went into creating the mess in the first place.
Third. It would take exponentially more time than what it took to consume the pile of wood.
Now take that and extrapolate to a planetary scale.
