Portland, US — As the world's population increased five-fold since the start of the 20th century, the changes in the geographic distribution ... population living in Africa and Europe.

South Africa is a middle-income emerging market ... Even though the country's modern infrastructure supports a relatively efficient distribution of goods to major urban centers throughout the ...

Those continuing changes in the distribution of the world’s population have weighty economic, political, social and environmental consequences (Table 1). Particularly noteworthy are the changing ...