How to make the green belt productive - but keep it green

Walkers on Box Hill, in the North Downs. Most green belt doesn't look like this. Image: Getty.

England’s green belts have had, and continue to have, a major impact on town planning. The idea of a ring of countryside surrounding an urban area to prevent sprawl originated in the 1930s, spread to post-war London and was adopted nationally in 1955. Today, about 13% of England is green belt land

But what made sense in the 1950s seems outdated and rather stale now. A one-size-fits-all approach to tackling complex planning issues tends to create more problems than it solves. You don’t need a belt-shaped area of land to check urban sprawl; you don’t need to block all development to promote greener outcomes. Perhaps in the 21st century it is time to admit that green belts are no longer fit for purpose.

In theory, the idea of still has strong protection within the government’s planning framework. That document identifies five strategic functions for the green belt:

  • To check the unrestricted sprawl of large built-up areas;
  • To prevent neighbouring towns merging into one another;
  • To assist in safeguarding the countryside from encroachment;
  • To preserve the setting and special character of historic towns; and
  • To assist in urban regeneration, by encouraging the recycling of derelict and other urban land.

But green belts have been attacked for failing to meet these purposes by a range of vested interests, who've proposed a range of different ideas in response. The head of Persimmon housebuilders, for instance, has called for a relaxation of green belt controls to ease the housing crisis. The chancellor wants more imagination from local planning authorities in where houses are built – including possible incursions into the green belt. Even Natural England, the government body responsible for safeguarding England’s natural environment, has previously called for a major policy rethink

In any case green belt protection is potentially illusory. Greenfield sites, including green belt, are increasingly favoured by developers as they are cheaper to exploit than brownfield sites which have much higher transaction costs. Here economic growth priorities and national planning policy tend to push development pressures onto the urban fringe areas, rather than to more costly brownfield land.

There is clear evidence that while green belts have stopped urban expansion (at least, in some cities), they have resulted in unintended consequences: higher-density development at the urban fringe, including disconnected “edge cities”, and “leapfrogging” development over the green belt to undermine other areas of countryside.

Green belts have a presumption against development, and thus come with little incentive to be positively managed for environmental, community or economic purposes. This leads to degraded landscapes which, while having a valid planning function, produce limited benefit to communities and the environment – unless, of course, you are lucky enough to live in or next to one.

As with natural assets more generally, it's this lack of incentive for active management that is the greatest cause for concern. It's therefore time for a fundamental rethink of the green belt.

Beyond the belt

For one thing, the “belt” metaphor has had its day. We should define bespoke areas that are functional to local geography and the needs of the cities and towns concerned; so wedges, fingers, belts, bananas or whatever shapes may equally apply.

Rather than have green belts used for just major cities we should also create a more inclusive, ubiquitous and positive set of zoning policies, that apply to large towns and major settlements.

Rather than a impose a rigid presumption against development, we should aim for zones that encourage innovative uses that generate investment in environmental and community benefits in keeping with the principles of sustainable development.

Finally, rather than enabling politically convenient incursions into the green belt under the guise of sustainable urban extensions, local planning authorities should define these zones by considering the long-term development needs of their area looking 50 years into the future rather than the present 25 years.

Positive spaces

These principles lead me to propose the idea of “green investment zones”: new positive spaces to invest in. The urban fringe could be rejuvenated by, for example, community food-growing initiatives for health and recreation, or wetland creation for flood protection and biodiversity. A green investment zone would be flexible enough to incorporate whatever new initiative an entrepreneur might propose.

This would require local planning authorities to think strategically, and come up with bolder and longer term visions about the kind of town or city they want to create. The current 25-year planning lifecycle is not long enough.

Developers shouldn’t see these zones as automatic no-go areas. While housing should not normally be allowed in them, they should act as valuable green spaces that can help to protect new and existing housing development from floods and drought. They can provide local food growing areas. and spaces for play and recreation. They also can be used to protect our agriculture and, perhaps more controversially, for energy production (solar, anaerobic digestion or biomass) – neglected planning factors, all.

In this green belt debate we need to move out of the silo thinking. Separating housing, industry, transport, community, landscape and environment needs just leads to disintegrated development.

The green belt may no longer be fit for purpose – but it must not be allowed to become a developers’ charter for nothing more than the short-term pursuit of economic growth. We need to create a more equitable, environmentally-friendly and socially-responsible zoning tool. In that way, we could address current planning shortfalls, and promote a more positive image for planning. The Conversation

Alister Scott is Professor of Environment and Spatial Planning at Birmingham City University.

He has received funding from Research Councils UK, Defra, Scottish and Welsh Governments as part of the Rural Economy and Land Use Programme for work on the urban rural fringe. He has also received funding from Research Councils UK, Defra and the Welsh Government as part of the National Ecosystem Assessment Follow on Programme. The ideas in this article stem from these research projects but are personal views and do not reflect the views of other partners in the research.

This article was originally published on The Conversation. Read the original article.

 
 
 
 

The IPPC report on the melting ice caps makes for terrifying reading

A Greeland iceberg, 2007. Image: Getty.

Earlier this year, the Intergovernmental Panel on Climate Change (IPCC) – the UN body responsible for communicating the science of climate breakdown – released its long-awaited Special Report on the Ocean and Cryosphere in a Changing Climate.

Based on almost 7,000 peer-reviewed research articles, the report is a cutting-edge crash course in how human-caused climate breakdown is changing our ice and oceans and what it means for humanity and the living planet. In a nutshell, the news isn’t good.

Cryosphere in decline

Most of us rarely come into contact with the cryosphere, but it is a critical part of our climate system. The term refers to the frozen parts of our planet – the great ice sheets of Greenland and Antarctica, the icebergs that break off and drift in the oceans, the glaciers on our high mountain ranges, our winter snow, the ice on lakes and the polar oceans, and the frozen ground in much of the Arctic landscape called permafrost.

The cryosphere is shrinking. Snow cover is reducing, glaciers and ice sheets are melting and permafrost is thawing. We’ve known this for most of my 25-year career, but the report highlights that melting is accelerating, with potentially disastrous consequences for humanity and marine and high mountain ecosystems.

At the moment, we’re on track to lose more than half of all the permafrost by the end of the century. Thousands of roads and buildings sit on this frozen soil – and their foundations are slowly transitioning to mud. Permafrost also stores almost twice the amount of carbon as is present in the atmosphere. While increased plant growth may be able to offset some of the release of carbon from newly thawed soils, much will be released to the atmosphere, significantly accelerating the pace of global heating.

Sea ice is declining rapidly, and an ice-free Arctic ocean will become a regular summer occurrence as things stand. Indigenous peoples who live in the Arctic are already having to change how they hunt and travel, and some coastal communities are already planning for relocation. Populations of seals, walruses, polar bears, whales and other mammals and sea birds who depend on the ice may crash if sea ice is regularly absent. And as water in its bright-white solid form is much more effective at reflecting heat from the sun, its rapid loss is also accelerating global heating.

Glaciers are also melting. If emissions continue on their current trajectory, smaller glaciers will shrink by more than 80 per cent by the end of the century. This retreat will place increasing strain on the hundreds of millions of people globally who rely on glaciers for water, agriculture, and power. Dangerous landslides, avalanches, rockfalls and floods will become increasingly normal in mountain areas.


Rising oceans, rising problems

All this melting ice means that sea levels are rising. While seas rose globally by around 15cm during the 20th century, they’re now rising more than twice as fast –- and this rate is accelerating.

Thanks to research from myself and others, we now better understand how Antarctica and Greenland’s ice sheets interact with the oceans. As a result, the latest report has upgraded its long-term estimates for how much sea level is expected to rise. Uncertainties still remain, but we’re headed for a rise of between 60 and 110cm by 2100.

Of course, sea level isn’t static. Intense rainfall and cyclones – themselves exacerbated by climate breakdown – can cause water to surge metres above the normal level. The IPCC’s report is very clear: these extreme storm surges we used to expect once per century will now be expected every year by mid-century. In addition to rapidly curbing emissions, we must invest millions to protect at-risk coastal and low-lying areas from flooding and loss of life.

Ocean ecosystems

Up to now, the ocean has taken up more than 90 per cent of the excess heat in the global climate system. Warming to date has already reduced the mixing between water layers and, as a consequence, has reduced the supply of oxygen and nutrients for marine life. By 2100 the ocean will take up five to seven times more heat than it has done in the past 50 years if we don’t change our emissions trajectory. Marine heatwaves are also projected to be more intense, last longer and occur 50 times more often. To top it off, the ocean is becoming more acidic as it continues to absorb a proportion of the carbon dioxide we emit.

Collectively, these pressures place marine life across the globe under unprecedented threat. Some species may move to new waters, but others less able to adapt will decline or even die out. This could cause major problems for communities that depend on local seafood. As it stands, coral reefs – beautiful ecosystems that support thousands of species – will be nearly totally wiped out by the end of the century.

Between the lines

While the document makes some striking statements, it is actually relatively conservative with its conclusions – perhaps because it had to be approved by the 195 nations that ratify the IPCC’s reports. Right now, I would expect that sea level rise and ice melt will occur faster than the report predicts. Ten years ago, I might have said the opposite. But the latest science is painting an increasingly grave picture for the future of our oceans and cryosphere – particularly if we carry on with “business as usual”.

The difference between 1.5°C and 2°C of heating is especially important for the icy poles, which warm much faster than the global average. At 1.5°C of warming, the probability of an ice-free September in the Arctic ocean is one in 100. But at 2°C, we’d expect to see this happening about one-third of the time. Rising sea levels, ocean warming and acidification, melting glaciers, and permafrost also will also happen faster – and with it, the risks to humanity and the living planet increase. It’s up to us and the leaders we choose to stem the rising tide of climate and ecological breakdown.

Mark Brandon, Professor of Polar Oceanography, The Open University.

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