Farms in the sky: a new solution to keep our cities well fed ScienceAlert ... air and relaxation within their busy urban life,” explain their creators in their project abstract. Suddenly the future of megacities doesn't look so bleak!
By 2025 the UN projects there will be 35 megacities (10m+) in comparison to 22 in 2011. Population growth of the top 15 megacities millions, 2001 to 2025 (projection) Tokyo 37m 39m (+5%) New Delhi 23m 33m (+42%) Shanghai 20m...
The rapid increase in the number of cities home to more than 10 million people will bring huge challenges … and opportunities...
It's not just that more people now live in cities than in the rural countryside (for the first time in human history). It's not just that major cities are growing increasingly more important to the global economy. The rise of the megacities (cities over 10 million inhabitants) is a startling new phenomenon that really is something we've only seen in the last 50 years or so with the expectation that the number of megacities will double in the next 10 to 20 years (currently there are 23). This reorganization of population entails wholesale restructuring of the economic, environmental, cultural and political networks. The urban challenges that we face today are only going to become increasingly important in the future.
These charts--made with information from weather satellites scanning the ground--show how wide and how tall cities around the world have grown. What’s happening to the size of cities in Asia will blow your mind.
Faced with the incomprehensible scale of worldwide mega-urbanization, observers have alternately fallen back on sheer numbers or city comparisons to drive home the speed at which cities in the developing world are growing. For example, New York University’s Shlomo “Solly” Angel projects the world’s urban population will double in 40 years, while urban land cover--including everything from skyscrapers to slums--will triple in size during that span. Grasping to put such numbers into context, the McKinsey Global Institute estimates China will build the equivalent of New York every other year for 20 years, while India needs to add the equivalent of a Chicago to its building stock annually.
The mind reels, but such comparisons tell us little about the truth on the ground--is the urban future of India more likely to look like Chicago or Dharavi (Mumbai’s famous slum) or something else completely? A satellite designed to measure ocean winds offers us a clue.
As part of a more interconnected world, our cities are playing an increasingly active role in the global economy. According to the McKinsey Global Institute (MGI), just 100 cities currently account for 30 percent of the world's economy. New York City and London, together, represent 40 percent of the global market capitalisation. In 2025, 600 cities are projected to generate 58 percent of the global Gross Domestic Product (GDP) and accommodate 25 percent of the world’s population. The MGI also expects that 136 new cities, driven by faster growth in GDP per capita, will make it into the top 600 by 2025, all from the developing world, 100 of them from China alone. The 21st century appears more likely to be dominated by these global cities, which will become the magnets of economy and engines of globalisation.
What if you put all 7 billion humans into one city, a city as dense as New York, with its towers and skyscrapers? How big would that 7 billion-sized city be? As big as New Jersey? Texas? Bigger? Are cities protecting wild spaces on the planet?
The breezy dark corridors between a city's tallest buildings seem like shady respites from the blistering summer sun. But it turns out those shadowy urban canyons are actually making your city more hell-like.
"In the above poster the cities are arranged (roughly, in order to maximize space) by population. Clearly, size and population are not directly correlated. Some cities take up a lot more space for a smaller population. The relationship between the two, of course, is known as density (population density, urban density)."
Delhi world's second most populous mega-city Times of India MUMBAI: The urban agglomerations of Mumbai and Delhi, which barely matched up to global cities in size in 1950, are now counted among the seven most populous mega-cities in the world,...
By 2025, the developing world will be home to 29 megacities.
Through this interactive mapping feature with rich call-out boxes, the reader can explore the latest UN estimates and forecasts on the growth of megacities (urban areas with over 10 million residents). These 'cities on steroids' have been growing tremendously since the 1950s and present a unique set of geographic challenges and opportunities for their residents.
Rapid urbanization will take a heavy toll on public health if city planning and development do not incorporate measures to tackle air pollution, warns a report launched in Beijing last month.
The report1, compiled by the World Meteorological Organization (WMO) in Geneva, Switzerland, and the International Global Atmospheric Chemistry (IGAC) project in Boulder, Colorado, was launched as part of the IGAC Open Science Conference on Atmospheric Chemistry in the Anthropocene. A striking point in the report, says Liisa Jalkanen, head of the WMO’s Atmospheric Environment Research Division, is how quickly megacities — metropolitan areas with populations of more than 10 million — are rising in developing countries.
There are now 23 megacities in the world, compared with just two 60 years ago. Just over half of the population currently dwells in cities, and with the urban population expected to nearly double by 2050, that proportion is projected to approach 70%. “Almost all this growth will take place in the developing world,” says Jalkanen.
THE increasing pace of urban housing eating into valuable farmland areas in the Sydney Basin has prompted a public forum at Penrith this week to be chaired by SBS television's popular wild man of food production, Costa Georgiadis.
Speakers at the question and answer program will include NSW Farmers Association president, Fiona Simson, and director of the University of Western Sydney's Urban Research Centre, Professor Phil O'Neill.
The NSW Government estimates the Sydney region's farm sector is currently worth about $630 million annually in production alone, including more than 90 per cent of the State's Asian vegetable crop.
The Penrith meeting, which is being promoted with the tagline "You can't eat your house - development threatens the food bowl", will be at the Joan Sutherland Performing Arts Centre between 7.30pm and 9pm, organised as part of this year's Sydney International Food Festival.
Other speakers include agricultural planner, Ian Sinclair, and Western Sydney Organisation of Councils president, Alison McLaren.
Symposium organisers point out that with the State Government now flagging more massive new commercial and urban development around Riverstone and ongoing growth in the Penrith, Rouse Hill, Camden and Hawkesbury areas, more houses on Sydney's fertile flood plains represent a big dilemma
"Just 200 years ago, there were only 1 billion people on the planet, and over the next 150 years, that number grew to 3 billion. But in the past 50 years, the global population has more than doubled, and the UN projects that it could possibly grow to 15 billion by the year 2100. As the international organization points out, this increasing rate of change brings with it enormous challenges."
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