Documents Earth’s Population History 1 billion reached circa 1830 2 billion reached 1930 (100 years later) 3...

Slide 1Earth’s Population History 1 billion reached circa 1830 2 billion reached 1930 (100 years later) 3 billion reached 1959 (29 years later) 4 billion reached 1974 (15…

Documents Urban Geography: overview Lecture Notes. System of cities with various levels Few cities at top...

Slide 1 Urban Geography: overview Lecture Notes Slide 2 System of cities with various levels Few cities at top level Increasing number of settlements at each lower level…