10,000 Years Later

What happens when the world is ravaged by nuclear war and natural disasters? Resources are scarce as is, and humanity is on the brink of extinction
Few governments are uncorrupted, but those few still out there struggle to make a plan where they can save a seed of humanity.
The answer? Thousands of vaults where those lucky few will be cryogenically frozen.
But what will happen if when they wake up, and the world is no longer able to support life? It will take thousands of years for the world to revert back to where it will be able to be safely habituated, some experts speculate.
Another answer. Set the timer for 10000 years!
What will the world look like 10000 years after humanity goes extinct? And what happens when Modern humans are introduced into such a world?
Follow a young survivor who wakes up in this new world. Who is he? And will humanity thrive once more or ultimately destroy itself in spite of the second chance they were all given?