Posts Tagged ‘vertical garden’
Here at Sustainable Melbourne we’ve been contacting Sustainable Cities Round Tables (SCRT) presenters, to find out how their projects and ideas have grown and changed since Ferne Edwards first launched the Round Tables in May 2007.
Ben Nicholson gave a presentation at the SCRT in November 2008, after spending two months studying green roofs in cities around the world as a Churchill Fellow. During this time, Ben met green roofs advocates; planners, environmentalists and designers, and he visited research sites and commercial sites, some of which have been in existence since the early 1990s. In his presentation, “Vital Signs for a Healthy City”, he described Melbourne as an adolescent city at risk of on-going health problems due to its large energy requirements, poor water management lack of biodiversity. Green roofs would change this prognosis by cooling the city, increasing urban food-growing space and wildlife habitat, and conserving storm water and energy.
In 2007, Ben established his own green roof consultancy, Groof, providing designs and advice to green roof developments in Victoria and overseas.
We caught up with Ben to ask about the changes in green roof implementation and acceptance in Australia since his presentation in 2008. There have been some notable green roof and wall projects developed in that time, including the vertical garden we sat next to in the foyer of the Gauge building in Docklands. During our conversation, Ben reiterated the importance of solid research and demonstration projects for industry players to assist in the development and maintenance of a successful Green Roof program in Australia’s cities.
Below are some extracts from Ben’s Churchill Trust Report:
Just as the ant spends a lifetime crawling up and down a tree without ever comprehending the tree’s full scale or its place in the wider world, so we spend our lives in cities without ever comprehending their true size or the impacts they are having on the planet… imagine for a moment you are sitting on a hill, watching a tree grow that, one day, will be crawled upon by an the ant mentioned above. And from this hill, imagine that you can fast-forward time as quickly as you like, so you sit and watch this tree grow from a tiny seed to a sapling to a huge, spreading lemon-scented gum in only a few short minutes. Now imagine that from the same hill you are watching your own city grow up from its earliest days of a few tents and dusty tracks into the sprawling suburbs, skyscrapers, freeways, factories and warehouses that it has become today. From this perspective, it is suddenly much easier to comprehend the amount of disruption that has occurred to all the other living things and natural systems forced to make way for the people and non-living things that make up your city today. We may never be able to bring everything back, but from the vantage of this hill we can at least start to imagine what our cities would look like when transformed into thriving eco-systems.
In many cities around the world, harm is being reducing by people as they build each new piece of eco-infrastructure into the city fabric. To do this properly, people first ask:
- what does harm look like?
- where is it most concentrated?
- where is the worst of it coming from?
During the fellowship I learnt that the green roof and wall industry in each city has developed in the presence of local champions, detailed science, government support and an enlightened citizenry. The people in the cities I visited have developed policy responses and designed ‘eco-infrastructure’ that is unique to their local topography, climate and system of governance. In the more advanced cities, I observed some or all of the following activities taking place:
- Environmental indicators such as topography, temperature, rainfall and biodiversity are examined to understand the ways in which a city impacts upon its host environment. Using data sourced from early settlement to the current day, time-lapse analysis reveals the extent to which the city has affected its surrounds. Forecasting models are then used to predict future impacts with the key variable being extent of vegetation cover.
- Economic costs for the design, construction and maintenance of air conditioning/cleaning systems, water supply/removal systems and agricultural production/distribution systems are compared with the costs of using green roofs and walls to identify areas of city management that can be carried out more efficiently using green roof and wall technology.
- The benefits of green roofs and walls are tailored to address environmental and economic ‘trigger points’ specific to each city. These trigger points inform local green roof and wall design and assist in targeting the most effective locations for the placement of green roof and wall infrastructure.
- Demonstration and research projects raise awareness and provide information for public, private and government sectors.
- Political support for green roofs and walls leads to subsidies for the eco-infrastructure industry and the incorporation of built form standards and incentives.
- Environmental and economic indicators are regularly monitored to refine eco-infrastructure design and placement.
- Over time, the economic and environmental costs associated with the negative impacts of urbanisation are reduced and the benefits associated with an increase in vegetation cover are multiplied.
As eco-infrastructure projects begin to reduce harm, there will be an increase in the demand for high quality products and services. It is therefore up to the people and companies who stand to benefit the most from this demand to provide funding for eco-infrastructure research and demonstration projects in the early phase of the industry’s development. We can learn a lot from the failures and triumphs of other cities. Now is the time to transform our negative impacts into positive ones. And in doing so, we will transform ourselves from being harmful pests to welcome guests.
Download Ben’s report to read more about his research, including case studies from his tour and further reading and recommendations.