7 London boroughs are more than 25% green belt

London's beautiful green belt. Image of Rainham Marshes courtesy of Romfordian, via Wikimedia Commons.

Ask whether it's time to re-think Britain's green belts, as we often do in these parts, and you're likely to get a mixed response. Part of your audience – the younger, more urban, more-likely-to-be-private-tenants part – will cheer you on. But a significant minority will call you all sorts of names, accuse you of being in the pocket of the construction industry, and probably at some point blame immigration.

Such is life. But since this debate isn't going to go away any time soon, we thought it might be worth injecting some figures into it. Let’s consider the Metropolitan Green Belt which has restricted London’s growth since 1938.

There are 33 boroughs in London, of which no fewer than 19 have at least some protected Green Belt land within them. This chart shows the size of those 19 by area (total bar length), and the proportion of each which is designated as Green Belt (the bit that's, well, green). We’ve taken our data from government figures, hosted here.

 

The first thing that you notice is that Bromley is enormous. At around 150 km2, it takes up very nearly a tenth of the entire capital, and it's larger than the eight smallest boroughs put together. (These are all in inner London, so don't feature on the graph.)

The next thing you notice is that more than half of that vast south eastern borough is green belt land (to be exact, 52 per cent of it).

In all, there’s around 77 km2 of Green Belt in Bromley: enough to swallow the City, Kensington, Islington, Hammersmith and Hackney whole, and still have room for most of Tower Hamlets. That's an area that houses nearly 1m people.

We're not seriously suggesting putting that many people in the green fields of Bromley. We're just pointing out that you could. Look:

Bromley isn't the only large outer borough that is, quite literally, half empty. Up in the north east, Havering is actually even roomier, with nearly 54 per cent of its land classified as Green Belt. Again, you can see this on the map, which shows that huge swathes of the borough are effectively empty.

To the west, Hillingdon is 43 per cent empty, while another four boroughs are more than a quarter Green Belt.

The point we're getting at here is that there is a lot of land classified as Green Belt even within London. In all, it's more than a fifth of the capital's land area (22.4 per cent).

As you might expect, the neighbouring areas are often even more in the grip of the Green Belt. Here's the same chart, but this time showing counties:

Now, “green belt" is actually at times a misleading label. The name evokes beautiful rolling fields, and some of this land will live up to that image. But it also includes quarries, and scrubland, and golf courses, and pony clubs. Some of this land is of value to the community; some of it isn't.

Nonetheless, there are those who see it as inviolable – who squeal at any suggestion we should re-label it as anything other than green belt, or develop it to meet London's housing needs. People who imagine that giving up even one blade of grass will turn the entirety of England into Houston within weeks.


But what it is that terrifies them so remains a complete mystery to me, because they are winning, hands down. Between 2007 and 2010, London lost approximately 140 hectares of green belt land, but gained another 100 elsewhere. In total, then, it lost 40. For those who are keeping score, that's just over 0.1 per cent of all its green belt land.

And this, remember, is not 0.1 per cent of the entire green belt – it’s 0.1 per cent of the portion of the green belt which is contained within the official boundaries of the city. The green belt as a whole is approximately 15 times larger, and that isn’t going anywhere either.

It'd probably be foolish to scrap the green belt altogether, and simply let the construction industry let rip. But it's equally naive to imagine that this land is, and must always remain, inviolable.

London can build the extra homes that its population needs. We've more than enough space.

 
 
 
 

Green roofs improve cities – so why don’t all buildings have them?

The green roof at the Kennedy Centre, Washington DC. Image: Getty.

Rooftops covered with grass, vegetable gardens and lush foliage are now a common sight in many cities around the world. More and more private companies and city authorities are investing in green roofs, drawn to their wide-ranging benefits which include savings on energy costs, mitigating the risk from floods, creating habitats for urban wildlife, tackling air pollution and urban heat and even producing food.

A recent report in the UK suggested that the green roof market there is expanding at a rate of 17 per cent each year. The world’s largest rooftop farm will open in Paris in 2020, superseding similar schemes in New York City and Chicago. Stuttgart, in Germany, is thought of as “the green roof capital of Europe”, while Singapore is even installing green roofs on buses.

These increasingly radical urban designs can help cities adapt to the monumental challenges they face, such as access to resources and a lack of green space due to development. But buy-in from city authorities, businesses and other institutions is crucial to ensuring their success – as is research investigating different options to suit the variety of rooftop spaces found in cities.

A growing trend

The UK is relatively new to developing green roofs, and governments and institutions are playing a major role in spreading the practice. London is home to much of the UK’s green roof market, mainly due to forward-thinking policies such as the 2008 London Plan, which paved the way to more than double the area of green roofs in the capital.

Although London has led the way, there are now “living labs” at the Universities of Sheffield and Salford which are helping to establish the precedent elsewhere. The IGNITION project – led by the Greater Manchester Combined Authority – involves the development of a living lab at the University of Salford, with the aim of uncovering ways to convince developers and investors to adopt green roofs.

Ongoing research is showcasing how green roofs can integrate with living walls and sustainable drainage systems on the ground, such as street trees, to better manage water and make the built environment more sustainable.

Research is also demonstrating the social value of green roofs. Doctors are increasingly prescribing time spent gardening outdoors for patients dealiong with anxiety and depression. And research has found that access to even the most basic green spaces can provide a better quality of life for dementia sufferers and help prevent obesity.

An edible roof at Fenway Park, stadium of the Boston Red Sox. Image: Michael Hardman/author provided.

In North America, green roofs have become mainstream, with a wide array of expansive, accessible and food-producing roofs installed in buildings. Again, city leaders and authorities have helped push the movement forward – only recently, San Francisco created a policy requiring new buildings to have green roofs. Toronto has policies dating from the 1990s, encouraging the development of urban farms on rooftops.

These countries also benefit from having newer buildings, which make it easier to install green roofs. Being able to store and distribute water right across the rooftop is crucial to maintaining the plants on any green roof – especially on “edible roofs” which farm fruit and vegetables. And it’s much easier to create this capacity in newer buildings, which can typically hold greater weight, than retro-fit old ones. Having a stronger roof also makes it easier to grow a greater variety of plants, since the soil can be deeper.


The new normal?

For green roofs to become the norm for new developments, there needs to be buy-in from public authorities and private actors. Those responsible for maintaining buildings may have to acquire new skills, such as landscaping, and in some cases volunteers may be needed to help out. Other considerations include installing drainage paths, meeting health and safety requirements and perhaps allowing access for the public, as well as planning restrictions and disruption from regular ativities in and around the buildings during installation.

To convince investors and developers that installing green roofs is worthwhile, economic arguments are still the most important. The term “natural capital” has been developed to explain the economic value of nature; for example, measuring the money saved by installing natural solutions to protect against flood damage, adapt to climate change or help people lead healthier and happier lives.

As the expertise about green roofs grows, official standards have been developed to ensure that they are designed, built and maintained properly, and function well. Improvements in the science and technology underpinning green roof development have also led to new variations on the concept.

For example, “blue roofs” increase the capacity of buildings to hold water over longer periods of time, rather than drain away quickly – crucial in times of heavier rainfall. There are also combinations of green roofs with solar panels, and “brown roofs” which are wilder in nature and maximise biodiversity.

If the trend continues, it could create new jobs and a more vibrant and sustainable local food economy – alongside many other benefits. There are still barriers to overcome, but the evidence so far indicates that green roofs have the potential to transform cities and help them function sustainably long into the future. The success stories need to be studied and replicated elsewhere, to make green, blue, brown and food-producing roofs the norm in cities around the world.

Michael Hardman, Senior Lecturer in Urban Geography, University of Salford and Nick Davies, Research Fellow, University of Salford.

This article is republished from The Conversation under a Creative Commons license. Read the original article.