I believe the answer you are looking for is the "Neolithic Period".
There won’t be most likely. Many glaciers are already melting at a fast pace already. They aren’t being formed either just melting. They’re shrinking significantly and will probably be gone soon because of climate change. Even glaciers that have been around for millions of years a melting away. :(
True, most people live along the Nile river
The Sydney opera house is in Australia (:
