Projections for the year 2050 predict that most of the 8 billion people on the planet will live in megacities, with populations over 30 million. And these megacity clusters will form a network made up of smaller cities over 1 million in population. But these incredibly dense clusters will weave through a countryside that is emptying. It is already common to find entire villages in China, India, and South America abandoned by its inhabitants who fled to the swelling cities, leaving behind a few old folks, or often, no one at all.
This is the pattern on Earth. Extremely dense and vast populations in a network of megacities connected to each other with nerves of roads and wires, woven over an empty landscape of wild land, marginal pastures, and lightly populated farms.
By 2050 and beyond, Earth will be a urban planet, while the average place on the planet will be nearly wild.
[Averages are tricky.]
Source: The Technium