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Mega cities

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A megacity is usually defined as a metropolitan area with a total population in excess of ten million people. A megacity can be a single metropolitan area or two or more metropolitan areas that converge.

The terms conurbation, metropolis and metroplex are also applied to the latter.

As of 2015, there are 35 megacities in existence. The largest of these are the metropolitan areas of Tokyo, Delhi, Seoul, Shanghai, Mumbai, Mexico City, Beijing, São Paulo, Jakarta, New York, Karachi, Osaka and Manila: each of these has a population in excess of 20 million inhabitants. Tokyo is the largest metropolitan area, while Shanghai is the largest city proper.

Tumblr_n6qnziKftl1qf3oz3o4_1280.jpg (JPEG Image, 1280 × 855 pixels) - Scaled (80%) Can a city become too big? There are now some three dozen megacities in the world, each sprawling areas home to more than 10 million people.

Can a city become too big?

Bigger cities come with obvious advantages, the increase in people, interactions and infrastructures create more opportunities and efficiencies. But massive population growth has also led to more pollution, spiralling rent, and crumbling infrastructure. These problems, according to theoretical physicist Geoffrey West, increase alongside population growth. "The bigger you are the more you get per capita. So the bigger you are, the more Aids cases there are, the more higher wages, the more crime there is, the more patents are produced and so forth.

West says all the super-sized cities around the world seem to share this concept of super-linear scaling. While they may share the same principles, the reasons driving them are very different. The problem is this type of planning often doesn’t pay any attention to human nature, says urban planner Wendell Cox. Neither was a success.

Mega Slums

Chongqing. Big Cities Head for Water Crisis as Populations Explode. Water pots waiting to be filled from a street tap in Chennai, India.

Big Cities Head for Water Crisis as Populations Explode

(McKay Savage via Wikimedia Commons) This Creative Commons-licensed piece first appeared at Climate News Network. LONDON—More than 40% of the world’s great cities supplied by surface water could become vulnerable to shortages and drought by 2040, according to new research. And more than three out of 10 were already vulnerable in 2010. Meanwhile, the vital array of satellites designed to monitor rainfall and to warn of potential flooding is reported to be coming to the end of its shelf life. For the first time in history, more than half the world’s population is now concentrated in cities, and this proportion is predicted to increase to two-thirds. Some cities are already under drought stress.

Supply analysis They proposed three different kinds of measure of supply. Urban Planning Ideas for 2030, When Billions Will Live in Megacities. The statistics are staggering: Researchers predict that by 2025, the world will have 37 megacities, defined as urban areas with more than 10 million people.

Urban Planning Ideas for 2030, When Billions Will Live in Megacities

New York City and Newark are expected to have more than 23 million inhabitants; Tokyo, more than 38 million people. All told, well over half of the world’s population will be living in these super settlements. “One number that isn’t referenced often is that two-thirds of that population will be poor,” says Pedro Gadanho, who curated Uneven Growth: Tactical Urbanisms for Growing Megacities at MoMA. That poverty translates into informal cities, like the favelas of Rio de Janeiro or illegally subdivided high-rises of Hong Kong. What Gadanho, and MoMA, want to explore is: How can urban planners work with these urban residents, not against them, to make cities more livable for everyone?

Click to Open Overlay Gallery. Megacities Are Growing So Fast We Need Satellites To Study Them. China’s mega-cities are combining into mega-regions, and they’re doing it all wrong. This item has been corrected.

China’s mega-cities are combining into mega-regions, and they’re doing it all wrong

You may never have heard of the southwestern Chinese city of Chongqing, but by some measures it is one of the largest and fastest-growing cities in the world, with an official population of 29 million—about the same as Saudi Arabia—and unofficial population of 32 million or more. The city center of Chongqing boasts a mere 9 million people, but dozens of satellite districts such as Fuling (population 1 million) and Wanzhou (1.6 million) are each major cities in their own right. URBAN GEOGRAPHIES: Cities / Places / Regions.

East Asia's Massive Urban Growth, in 5 Infographics. Almost 200 million people in East Asia migrated from rural areas to cities between 2001 and 2010.

East Asia's Massive Urban Growth, in 5 Infographics

If all these people were to band together and declare themselves a country, it would be the world's sixth largest. That's a lot of people. A new World Bank report uses satellite imagery and geospatial mapping to compare this influx of people with the expansion of urban areas from Mongolia and Myanmar on up to Japan. It finds that although cities in the region expanded at breakneck speeds during this period, they couldn't keep up with ballooning urban populations. New residents poured into cities at an average of 3 percent per year, while land expansion happened at a 2.4 percent annual rate, according to the report. China Plans to Move 250 Million into Cities by 2025. The Chinese government is pushing forward with a plan that will move 250 million Chinese people from rural communities into newly constructed towns and cities over the next 12 years.

China Plans to Move 250 Million into Cities by 2025

The government has been bulldozing ancient villages, temples and open-air theaters as well as paving over farmland to make way for mega-cities that will raise the number of city-dwellers in China to nearly the total urban population of the US. To find out how and why this is happening, keep reading. Cities - The Real Shanghai 1 of 2 - BBC Travel Documentary. Megacities Reflect Growing Urbanization Trend. National Geographic Documentary - Mega Cities - Hong Kong. Bright lights, big cities. AT THE beginning of February, somewhere in London, a maternity ward welcomed the city's 8,615,246th inhabitant.

Bright lights, big cities

The mayor of London reckons that the British capital has now surpassed its previous population peak set in 1939. But if it occasionally feels cramped on the Tube, the task for other city planners around the world looks far more daunting. Cities on Earth evolve in the same way as galaxies in space. There are several laws known to sociologists that seem to govern, in unnervingly accurate fashion, how we live in cities here on Earth.

Cities on Earth evolve in the same way as galaxies in space

One is Zipf’s law, which states the rank of a city is inversely proportional to the number of people who live in the city. So the biggest city in a country has 10 million people, then the second-biggest city is 10 million divided by two, the next by three, and so on. While most of these scaling laws, such as Zipf’s law or ones that determine the spread of sexually-transmitted diseases, have been observed to be true in the wild, we don’t have any real sense of where they come from or why they work. Strange Visions of the Hyper-Congested Megacities of the Future. Timeout IV—Hardy Road, Spring, Texas, USA Marcus Lyon BRIC III—Yugo-Zapadniy Okryg, Moscow.

Strange Visions of the Hyper-Congested Megacities of the Future

Global South

Mekong Delta & HCMC. Megacities, Mega regions. Future of cities.