Where do the walkers keep coming from? (Discuss)

After all, we must have killed the world's population many times over by now so where are all these extra walkers coming from? It's not like they can reproduce, is it!
Just wondering......
Anyone got any theories?
Just wondering......

Anyone got any theories?
“You never know how strong you are until being strong is your only option.” (Bob Marley)
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Did everyone reanimate that would already? Are all the "graves" empty? If every person ever over every year in history can reanimate then we got a long way off. But even then how long is too long? Can my gma who passed in '94 comeback?
At what point are you too decayed to no longer be able to "reanimate"
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http://www.memorialpages.co.uk/articles/decomposition.php
Decomposition in the air is twice as fast as when the body is under water and four times as fast as underground. A corpse left above ground is rapidly broken down by insects and animals, including bluebottles and carrion fly maggots, beetles, ants and wasps. A corpse can become a moving mass of maggots within days, even hours in hot climates. Approximately 150,000 maggots can be found on an exposed corpse. Left above ground the the main body cavities burst open and the tissues become liquefied after about a month or so.
When buried six feet down, without a coffin, in ordinary soil, an unembalmed adult normally takes eight to twelve years to decompose to a skeleton. However if placed in a coffin the body can take many years longer, depending on type of wood used. For example a solid oak coffin will hughly slow down the process. I believe there was a case where a body was exhumed in an oak coffin and it was found to still be in a state of decomposition some 50 years later. Of course a lot also depends on how deep the coffin is buried, the state of the soil and the local water table.
Also there is something I saw recently that discussed cremation is rising to about 40% (http://www.huffingtonpost.com/2014/08/13/cremation-on-the-rise-infographic_n_5669195.html)
So once we get past the Jason and the Argonaut phase of skeletons being taken out, looks like the coast is clear. So despite the angst associated with this whole zombie end of the world thing, just need to wait it out a bit more.
My pistol packing kitten is just waiting it out
At least in The Walking Dead everyone is infected and people occasionally die from other things without being put down, but in most settings, every zombie has to be someone who was bitten and got away without being eaten.
So if there were 7b, then that would give another 7b.
We have. Off the top of my head... did you forget abt that nonsense of the entire first half of season two? Aka Lets waste time searching for Sophia in the woods. Then she walks out the barn.
Also one of Noah's twin brothers, which bit Tyrese. I may be missing others.
1 - Bones are not "attached" to other bones. They use muscle etc to hold everything together.
2 - They need to have some part of the brain still going (not sure if they have said which part, it seems any damage to the brain kills them). So the likelihood is with the decomposition will come the decomposition of the brain, which should kill them.