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Published on October 16th, 2012 | by James Ayre

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Cities Will Greatly Benefit from More Greenery as Urban Areas Rapidly Expand, UN Report Finds



 
As urban areas of the world continue to grow, there is a great opportunity to improve cities, making them healthier for people, simply by increasing greenery, according to a study released by the UN on Monday.

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It’s been estimated that urban areas will more than double in size by 2030. With proper measures in place, this growth can greatly improve the quality of life for those living in cities.

Some of those measures are to increase parks, trees, and rooftop gardens and greenery. These actions can, somewhat surprisingly, go a long way towards decreasing city pollution, as well as helping to protect local plants and animals. This is considered especially important in rapidly growing nations like China and India, where city growth can occur practically overnight.

Rich biodiversity can exist in cities and is extremely critical to people’s health and well-being,” wrote Thomas Elmqvist of the Stockholm Resilience Centre, scientific editor of the Cities and Biodiversity Outlook.

Urban populations throughout the world are expected to dramatically rise in the coming years, from around 3.5 billion currently to over 4.9 billion by 2030, according to the assessment by the UN Convention on Biological Diversity.

And the area that these cities take up is expected to rise expand by at least 150 percent.

“Most of this growth is expected to happen in small and medium-sized cities, not in megacities,” according to the report, issued to coincide with a UN meeting on biodiversity in Hyderabad, India.

By adding more greenery to cities, significant amounts of pollution and dust can be filtered out of the air fairly well and do some to limit the heat-trapping effects of local carbon dioxide emissions. There has been some recent research that has shown that the local presence of trees can do a decent job of reducing asthma and allergies for children living nearby.


 
The study also makes the point that cities are currently serving as the environment to a wide assortment of plants and animals.

Incredibly, “more than 65 percent of Poland’s bird species are found in Warsaw. In South Africa, Table Mountain national park, rich in wildlife, is surrounded by the Cape Town municipality. In the United States, Saguaro national park is just outside Tucson.”

“Sustainable urban development that supports valuable ecosystems presents a major opportunity for improving lives and livelihoods,” said Achim Steiner, head of the UN Environment Programme.

Increased tree cover in cities also works pretty well to reduce city temperatures during the summers, potentially saving on cooling costs and electricity use for the cities inhabitants.

“Recent studies highlight the importance of even small urban gardens in providing habitat for native pollinators such as bees, which have declined alarmingly in recent years,” the study added.

It’s also easy to argue for the economic benefits of adding greenery. In the United States, “city parks increase the value of nearby residential properties by an average of 5 percent; excellent parks can provide a 15 percent increase.”

And one of the most important reasons for increasing the greenery in cities is that, as urban areas expand, agricultural area is being lost, and there is going to have to be a shift in where agriculture occurs if such growth is to continue.

“For the next 40 years urban growth will consume land approximately three times the size of France … this is often the most prime agricultural land,” Elmqvist said.

Currently, there are many cities that are already taking measures to become greener. “In Bogota, Colombia, residents exercised more after city authorities introduced measures such as closing some roads on weekends and improving bus transport.”

And in Mexico City, a new “Green Roof Program” is planning to create at least 10,000 square meters (107,000 sq ft) of rooftop agriculture every year.

Source: Reuters
Image Credits: Rockefeller via Wikimedia Commons

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About the Author

James Ayre's background is predominantly in geopolitics and history, but he has an obsessive interest in pretty much everything. After an early life spent in the Imperial Free City of Dortmund, James followed the river Ruhr to Cofbuokheim, where he attended the University of Astnide. And where he also briefly considered entering the coal mining business. He currently writes for a living, on a broad variety of subjects, ranging from science, to politics, to military history, to renewable energy. You can follow his work on Google+.



  • wattleberry

    No mention was made of vertical hydroponic ‘gardens’ on walls. Has this actually been adopted anywhere yet?

  • StefanoR99

    It’s a great concept but it’s always overlooked by planning officials and developers who take the “cover it with as much concrete as possible” approach because they equate every sqft to the same value.

    No one seems to realise in urban development that if you increase green space, the value of the property around and near that green space increases astronomically. Just look at NY central park…

    We need more Parks and Recreation! :)

    • http://cleantechnica.com/ Zachary Shahan

      As a planner by training, i have to say that almost all the planners i know are big fans and proponents of parks & greenspace. Actually, wouldn’t be many of those at all if it weren’t for planners. :D

      • StefanoR99

        That’s awesome to know :) Have to lay the blame at the door of property developers then… Everyone wants to live near a big green area, cities need more.

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