Infrastructure and real estate present varying ESG risks to institutional investors, but there are still opportunities to fund environmentally and socially responsible construction projects that offer acceptable returns.
It cost A$49 million to add 12.5 kilometres of extra lanes to Western Australia’s Kwinana Highway, south of Perth’s CBD. That’s not unusual. On average, building a single lane of road costs about about A$5 million per kilometre.
Recycling building and construction materials remains the exception to the rule in Australia. The National Waste Policy agreed to by federal, state and territory governments has a target of 80% resource recovery by 2030. It’s currently about 40%.
Of the 74 million tonnes of waste generated in Australia in 2020, masonry materials comprised about 22.9 million tonnes. Plastics, by comparison, comprised about 2.5 million tonnes. Of the 61.5 million tonnes of “core waste” managed by the waste and resource recovery sector, 44% (27 million tonnes) came from the construction and demolition sector, compared with 20% (12.6 million tonnes) from households and local government activities.
Most of this waste – concrete, brick, steel, timber, asphalt and plasterboard or cement sheeting – could be reused or recycled. It ends up in landfill due to simple economics. It’s cheaper to buy new materials and throw them away rather than reuse and recycle.
Changing this equation and moving to a circular economy, in which materials are reused and recycled rather than discarded in landfill, is a key goal to reduce the impact of building and construction on the environment, including its contribution to climate change.
The economics of ‘externalities’
The fact it is more “economic” to throw materials away than reuse them is what economists call a market failure, driven by the problem of “externalities”. That is, the social and environmental costs of producing, consuming and throwing away materials is not reflected in the prices charged. Those costs are instead externalised – borne by others.
In such cases there is a legitimate – and necessary – role for governments to intervene and correct the market failure. For an externality such as carbon emissions (imposing costs on future generations) the market-based solution favoured by most economists is a carbon price.
For construction material waste, governments have a few more policy levers to help create a viable market for more recycling.
Using procurement policies
One way to make recycling more attractive to businesses would be to increase the cost of sending waste materials to landfill. But this would likely have unintended consequences, such as illegal dumping.
The more obvious and effective approach is to help create more demand for recycled materials through government procurement, adopting policies that require suppliers to, for example, use a minimum amount of recycled materials.
With enough demand, recyclers will invest in further waste recovery, reducing the costs. Lower costs in turn create the possibility of greater demand, creating a virtuous circle that leads to a circular economy.
Australia’s federal, state and territory governments all have sustainable procurement policies. The federal Sustainable Procurement Guide states the Australian government “is committed to transforming Australia’s waste into a resource, where most goods and services can be continually used, reused, recycled and reprocessed as part of a circular economy”.
But these policies lack some basic elements.
Three key market-making reforms
Our research suggests three important reforms could make a big difference to waste market operations. This is based on interviewing 27 stakeholders from the private sector and government about how to improve sustainable procurement.
First, government waste policies that set aspirational goals are not supported by procurement policies setting mandatory minimum recycled content targets. All contractors on government-funded construction projects should be required to use a percentage of recycled waste materials.
Second, the nature of salvaging construction materials means quality can vary significantly. Cement recycled from a demolition site, for example, could contain contaminants that reduce its durability.
Governments can help the market through regularly auditing the quality of recycler’s processes, to increase buyer confidence and motivate suppliers to invest in production technologies.
Third, in some states (such as Western Australia) the testing regimes for recycled construction products are more complex than that what applies to raw materials. More reasonable specifications would reduce compliance costs and thereby the cost of using recycled materials.
A global assessment of rice yields and efficiency in 32 rice cropping systems concluded that there is still substantial room to increase rice production while reducing the negative environmental impacts. A leading agronomist describes the study as ‘the most comprehensive global evaluation of production systems for a major staple crop, (one that) will set the standard for future global comparison.’
Enzymes are capable of degrading synthetic polyisoprene. The specific conditions for that have now been created and exploited. Polyisoprene is the principal component of natural rubber and of many types of rubber also used in car tires, for example. Up until now, it has only been possible to degrade polyisoprene, with a composition similar to naturally occurring rubber. The present research could provide important insights toward a circular economy.
Toxic metals in the environment may increase the risk of atherosclerosis, a buildup of plaque in the arteries that can prevent blood and oxygen from reaching major organs. Arsenic and cadmium, metals that can be found in food, water and tobacco, plus titanium, which can come from dental and orthopedic implants, cosmetics or auto manufacturing, were associated with a higher likelihood of having clogged arteries in the neck, leg and heart in this study of auto assembly workers in Spain.
Current global environmental, occupational and food safety standards may be insufficient to protect people from the adverse effects of metals, according to study authors.
A new computational tool developed by researchers at MIT could let architects and engineers lower the carbon footprint of buildings and bridges. The tool helps designers pick the best material that minimize carbon emissions of trusses, those crisscrossing structures of beams and struts used to construct bridges, antenna towers, and buildings.