Been thinking along the lines of Planet of the Apes -but without any man made catastrophe, meteorite impact and climate stabilization- what sort of structures or evidence of our civilization would remain in five or six million years if we all just vanish? Would an intelligent species of evolved insects -or something else- find buried artifacts in the ground like we did the dinosaurs? Would ancient structures like the pyramids or Great Wall remain for that long, and would any modern things like the Eiffel tower, Burj Khalifa, or even some present day Doomsday Vaults survive that amount of time? In our digitized age, I assume that not much would remain, other than satellites maybe or I suppose any modern species that just happens to get preserved like a dinosaur did.
Earth would never get fossil fuels back as their formation was dependent on lacking fungi to break plants down. This is indeed our one shot.
Well, no. Arabian oil is only a few million years old and peat, a precursor to coal, is still being formed. I could imagine new oil being formed in the Gulf of Mexico and in the Indonesian archipelago