This Modern World: "Someday there will be people speaking languages vaguely resembling our own but indecipherable if we could eavesdrop. Their maps will not be our maps. And they will look at our wars over half-forgotten gods the same way you and I look at the struggles between the tribes of Ur, very possibly while killing each other in the name of gods which do not yet exist.
They will dig and puzzle and speak of the Oil Age and how its brevity stunned humankind toward the end.
If we make good choices, perhaps they will remember us fondly for they way we handled the first truly global period in human history, and they will carry our wisdom forward to our children's far descendants.
If we don't, they will more likely make small figurines of oxen and bury them in mud brick dwellings with their infant dead. With luck, maybe someday they'll develop bronze."