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Bad for you, bad for the environment. Junk food image from www.shutterstock.com

Looking for a new reason to cut down on “junk” food? Besides the obvious health-related benefits, I showed in a recent study that discretionary or junk foods make up a significant proportion of food-related environmental impacts.

For an average Australian household, my research found that discretionary food contribute 33-39% of diet-related water use, energy use, greenhouse gas emissions and land use.

Why is this a problem? In a warming world with a growing population and dwindling resources, we can no longer afford discretionary consumption that harms both our own and the planet’s health.

Although the topic of sustainable diets is becoming more popular, the debate and proposed policies have not sufficiently questioned the proliferation of junk food products that use scarce resources to produce empty calories.

Sustainable and healthy

The global food system accounts for around 25% of greenhouse gas emissions, 70% of water use and 38% of land use. We urgently need to meet climate targets and ensure food security. But it is increasingly recognised that making agriculture more efficient (to produce more food while using less resources) will not be enough. More sustainable diets are therefore essential.

National dietary guidelines are designed to help us eat more healthily. Recent iterations in Brazil, Sweden and the Netherlands also stress the importance of health and sustainability.

Animal-derived foods generally have bigger total environmental footprints than plant foods. This is because of the significant amounts of land, water and feed required by livestock and the methane released by ruminants.

Many recommendations to achieve healthy and sustainable diets have therefore justifiably focused on the need to reduce meat and animal-derived product consumption.

Diets such as the Mediterranean, rich in vegetables, fruit, legumes and wholegrains, seem to achieve the right balance between health and sustainability. A key characteristic of the traditional Mediterranean diet is the limited amount of discretionary food.

Enter junk foods

The Australian Dietary Guidelines describe discretionary foods as: “foods and drinks not necessary to provide the nutrients the body needs, but that may add variety. Many of these are high in saturated fats, sugars, salt and/or alcohol.”

By contrast, non-discretionary foods are those belonging to the core food groups: fruit, vegetables, cereals, legumes, nuts and seeds, dairy and unprocessed meat.

We all know that discretionary foods are unhealthy, but how do different products compare in terms of environmental impact?

There is a serious absence of research quantifying the environmental impacts of these foods. We would expect that the more processing our food goes through, the greater its overall impact due to cumulative energy and other input requirements.

However, my research shows that it depends on a number of factors – an issue highlighted in other studies on the general environmental impacts of diets. Junk foods almost always use more energy, but land and water use vary between products. Work in this area is still evolving.

However, this variability should not get junk foods off the hook, especially given their contribution to obesity. The question becomes whether these foods are consumed in excess, or whether they have displaced core foods – as can be the case for poorer socioeconomic groups.

The average energy intake of most Australians is above that recommended for their age and activity levels. That means we have to eliminate excess energy consumption, and we could consider eating junk food as a form of food waste.

If less discretionary food is produced, this means either that more unprocessed ingredients are available in their more nutritious forms, or that less agricultural production is necessary. Both could reduce environmental impacts.

What can we do about it?

Well, it’s complicated. The solution should ultimately tackle the heart of the problem, which is why we overconsume these foods in the first place.

Encouraging dietary shifts away from junk foods is challenging because of their cheapness, taste and convenience. Discretionary foods are also aggressively promoted to consumers due to their high profitability.

This last point epitomises what is fundamentally wrong with our food system, and why it’s not supporting health and sustainability in the way it should. While carefully selected food taxes and subsidies, in addition to better labelling and restrictions on junk food advertising, can help reduce their consumption, these consumer-oriented measures are only part of the solution.

Food producers should ultimately be held responsible for the proliferation of cheap discretionary food. We need to encourage divestment away from unhealthy, unsustainable products through regulation and public pressure, following the example of measures to address climate change.

As the developing world continues to transition towards more “Westernised” diets, food consumption patterns are likely to become even more environmentally intensive.

To feed more people sustainably we need to trim off the excess by not only reducing the consumption of animal products, but also by fighting overconsumption of discretionary foods and the associated waste.

Michalis Hadjikakou receives funding from the Australian Academy of Science through their WH Gladstones Population and Environment Fund.

Last week’s storm and subsequent state-wide blackout in South Australia reminds us how important the electricity grid – and other infrastructure – is for our communities.

Immediate analysis suggests the blackout was caused by the collapse of transmission infrastructure in South Australia. Australian electricity networks, like most transmission networks worldwide, rely on above-ground conducting wires held aloft by large towers. Some of these towers were blown over in the South Australian event.

While the storm hasn’t yet been specifically linked to climate change, it also serves as a reminder of the increasing challenges of delivering essential services in a more variable climate and slowing economy.

Power, water, transport, health, defence and communications infrastructure can be exposed to climate variability and change simply because of their long lifetimes. Therefore, many if not most owners and operators of essential infrastructure have commissioned climate vulnerability and adaptation studies.

There are many good examples of adaptation. For instance, Queensland Urban Utilities, the major water distributor and retailer in south-east Queensland, is implementing a large program to make the water and wastewater delivery network more resilient to flooding.

But there is increasing recognition among climate adaptation researchers that many of the recommendations from climate adaptation studies aren’t being adopted. This is sometimes referred to as the “plan and forget” approach to climate adaptation and it leaves critical infrastructure vulnerable to weather extremes.

Speaking different languages

One of the less obvious reasons for lack of uptake is the difference in language used in the climate science and adaptation community and in the infrastructure community.

All technical disciplines develop their own specialised language and climate science is no exception. But planning for climate change means that infrastructure professionals have to apply climate science to engineering planning and design.

Both disciplines use risk management as a common framework for assessing and managing risks. But the “bible” of climate science, the Intergovernmental Panel of Climate Change (IPCC) process, has invented new definitions of risk.

These differ from the long-standing definitions of risk enshrined by the International Organisation for Standardization and widely used by the engineering and infrastructure community.

Many engineers find they cannot use the IPCC reports and projections because this information cannot be directly integrated into planning and design processes that are often heavily regulated and prescribed.

By necessity, climate projections are based on probabilities that specified environmental conditions may occur.

By contrast, engineering design is often based on a specified extreme number, whether it be a maximum wind strength or flood height, rather than a set of probabilities.

Over time it is expected that engineering design methodologies will be able to assimilate climate projections, but updating these highly prescriptive standards can be a drawn-out process.

Harder, better, faster, stronger

Often the most common recommendations in infrastructure climate adaption studies are to make infrastructure stronger, higher and, by implication, heavier and more expensive. A common example is a recommendation that bridges be elevated and made stronger to account for expected higher flood levels and water flows.

While this is understandable, it is in stark contrast with the way almost all other products are being developed – lighter, faster, cheaper, smarter.

Australia is also consistently either at the top, or near the top, of the infrastructure cost league table. It’s one of the most expensive places to design and construct infrastructure worldwide.

Therefore, climate adaptation recommendations to make infrastructure more resilient through brute strength can be difficult to fund – although, in some cases, this may be the only viable option.

Getting creative

We need to think a little more creatively. A good starting point is to take the approach advocated in the relatively new international asset management standard called the ISO 55000 standard.

A key part of this standard is not to think about infrastructure assets in isolation, but to consider how each asset contributes to an essential service, such as providing electricity to our homes. After all, infrastructure assets are only constructed to deliver a service. It is the service that is key, not just the individual asset.

Importantly, the demand for services, levels of service and the way essential services will be delivered in future decades is all largely unknown. Technology will change how essential services are defined and delivered.

Distributed energy – such as rooftop solar – may reduce the need for extensive transmission networks. Smarter combinations of light rail and autonomous vehicles may change demand for major road infrastructure.

New water-treatment technology, such as within-pipe treatment, may do away with the need for large treatment plants that are often located in low-lying regions exposed to sea-level rise.

Climate adaptation needs to stop recommending that existing infrastructure just be built stronger and higher, and take a broader and smarter perspective of what infrastructure may be required as climate change increasingly makes its presence felt.

Mark Gibbs does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond the academic appointment above.

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South Australia's wind energy is providing secure energy to the state. Wind image from www.shutterstock.com

In the wake of South Australia’s wild weather and state-wide blackout, both Prime Minister Malcolm Turnbull and Energy Minister Josh Frydenberg have emphasised the importance of energy security.

Turnbull stated that the blackout was a wake-up call, suggesting that reliance on renewables places very different strains and pressures on a grid than traditional coal-fired power.

The assumption that these politicians and others are working off is that South Australia’s wind industry has reduced the state’s energy security.

But do these politicians really know what energy security means in a modern energy landscape?

The baseload question

Baseload power is an economic term that refers to power sources that consistently generate electrical power, therefore meeting minimum demand. The minimum demand for electrical power from an electrical grid is referred to as the baseload requirement.

The underlying assumption is that the only way of supplying baseload electricity demand is by means of power stations, such as those fired by coal, that operate at full power all day and night. This is a widely held belief in Australia.

A former Australian industry minister, Ian Macfarlane, claimed at a uranium industry conference that the only serious alternative way that baseload power can be produced is by hydro and nuclear.

But this is not entirely true. In 2014 South Australia got 39% of its electricity from renewable energy (33% wind plus 6% solar). Consequently, the state’s coal-fired power stations have become redundant.

To date, despite a couple of teething problems, the system has operated reasonably well given the enormous transitional challenge.

It has strongly demonstrated the ability to achieve energy security via an energy mix that combines renewables, gas and a small amount of imported power from Victoria. The South Australian system also highlights the fact that baseload power is not synonymous with fossil fuels.

Across Australia, many coal-fired power stations have been operating at reduced capacity. For example, the Mount Piper power station near Lithgow, New South Wales, has been operating at only 45% capacity despite the closure of the nearby Wallerawang coal plant.

In this context, diversity of renewable energy sources is key. Wind and solar are dependent on the right weather to generate electricity. But fluctuations in energy generation can be balanced with alternatives that can supply power on demand, such as hydro, concentrated solar thermal power (CST) or bio-fuelled open-cycle gas turbines.

Spreading out wind and solar PV farms also reduces this variation. Wind and solar must also be connected with new transmission lines to achieve wide geographic distribution and ensure diversity is promoted within the grid.

We also need smart energy management. It is possible to shave off peaks during periods of high electricity demand by using smart meters and consumer-controlled switches. These devices allow consumers to turn off power-intensive facilities, such as air conditioning, water or heating, for short periods when demand on the grid is high or supply is low.

Two sides of the same coin

Energy security is not about traditional baseload power production. It is really about the capacity of households, businesses and government to accommodate disruptions in the supply in energy markets. This doesn’t just mean weather, it also means broader changes that are shaking up the energy sector.

The primary global driver changing our approach to energy production is climate change, a direct product of carbon-intensive emissions produced by traditional baseload power generation.

Reducing greenhouse gas emissions is crucial for human flourishing. Reducing our dependency on fossil fuel power stations and shifting to a renewable energy mix is one way to achieve this.

For example, if and when the Hazelwood power station in Victoria closes, it will be the product of the inevitable shift away from carbon-intensive energy production.

The closure will produce a significant decrease in traditional baseload power. It will inevitably affect supply to other states, including South Australia, New South Wales and Tasmania, as Hazelwood (through the eastern Australian transmission network) provides power to each of these states.

In this context, a secure energy future depends on energy diversity. Traditional baseload power needs to be replaced with a mix of renewable energy sources that combined are capable of achieving the equivalent of baseload power.

Dealing with more renewables

Energy security demands speeding up rather than slowing down renewable energy production and diversification.

Improving storage for wind and solar production is a priority, as is improving connectivity between the states, with the aim of increasing the renewable energy traded across borders.

Micro-grid technology will also be crucial. Microgrids are essentially localised grids that have the capacity to disconnect from the traditional grids and operate on their own. This can help reduce grid disturbances and strengthen resilience. Microgrids are important because they serve local energy loads and, in so doing, reduce losses in transmission and distribution.

Some states have already implemented strategic groups to assess the energy security issues they are facing. For example, the Tasmanian Energy Security Taskforce was implemented in 2016 with the specific aim of examining how the state’s energy security can be strengthened and improved.

The consultation paper recently released by the taskforce states that energy security in Tasmania must focus on meeting long-term energy demand to a level of energy reliability that consumers will be prepared to pay for.

The taskforce will examine the potential for reduced Basslink exports at high prices in Victoria, the costs of competing fuel sources for generation, and the costs associated with developing new generation and the associated system reinforcements.

The Tasmanian taskforce seeks to examine a range of inter-related factors that include: progressing an energy mix in renewables; reducing energy security risks from extreme weather events such as storms and bushfires; and examining how much cost consumers are willing to assume to transition energy production to achieve a higher level of energy security for the state.

The one thing these developments reveal is that energy security, both in Australia and globally, is not about going backwards to some outdated reliance upon fossil-fuelled baseload power. Energy security is about new forms of baseload power.

Its success will ultimately depend upon our capacity to transition our energy systems as we head towards our new energy future.

Samantha Hepburn does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond the academic appointment above.

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