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Government may justify delisting the threatened species or order a cull despite its treaty obligations, senator says

A scientific study of great white shark numbers could be used by the government to justify delisting the species as threatened or ordering a cull despite international treaty obligations, the Greens senator Peter Whish-Wilson has warned.

Whish-Wilson, who is chairing a committee inquiring into shark mitigation and deterrence, has accused the Liberals of politicising recent deaths in Western Australia, including that of 17-year old Laeticia Brouwer through their calls to end protection of great whites.

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Milldale, Derbyshire The adult whirred downstream. The juvenile, sat still for a bit, gaped, grew restless, then launched itself into the stream

The grassy east bank of the river Dove below the packhorse bridge at Milldale, in the Peak District, is popular with picnickers and we had to drift downstream to find a little space. Once prone, bagel in hand, I half dozed, half watched insects forming clouds over the river, catching sunlight like chaff.

But then I snapped awake as I realised I was being watched. A rich brown eye glistened as it fixed on mine from no more than three metres away – a juvenile dipper clamped to a broken branch jammed in the rocks, deep in shadow, breaking the flow of water.

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We deserve better leaders. If the incumbency is not prepared to act on Adani, the community need to take matters into their own hands.

WIRSOL opens office in Sydney and plans to expand its activities.

In what's being called a "breakthrough moment", AEMO and ARENA team up to provide 100MW demand response capacity to meet next summer's critical peaks. The program will focus on technologies like solar and storage in a way previously ignored by policy makers.

France's new energy minister says nuclear industry business model belongs to the past. His appointment expected to hasten transition away towards renewables.

Queensland enjoys favourable sunshine hours that support both domestic and large-scale solar assets - but what about wind?

The federal government recently announced that it is giving recycling company ResourceCo a loan of A$30 million to build two waste-to-fuel plants producing “solid waste fuel”.

Waste-to-energy is an important part of the waste industry in Europe. Significant demand for heat means efficient and tightly controlled waste incinerators are common. However, Australia lacks an established market, with low levels of community acceptance and no clear government policy encouraging its uptake.

But the federal announcement, coupled with an uptake in state funding, a New South Wales parliamentary inquiry and several new projects in the pipeline, signals a growing interest in waste-to-energy and waste-to-fuels.

But what is solid waste fuel, and where does it fit in a sustainable future for Australian waste management?

What are solid waste fuels?

Australians are becoming more wasteful. The amount of rubbish we produce is growing more rapidly than both our population and our economy.

Recycling has been the main approach for recovering resources and reducing landfill over the past 20 years, but a lot more needs to be done.

One part of the solution is “waste-to-energy”: using a range of thermal or biological processes, the energy embedded in waste is captured, making it available for the direct generation of heat and electricity, or for solid fuel production (also known as “processed engineered fuel”).

Briquettes or fuel pellets can be made out of paper, plastic, wood waste or textiles. Dario Sabljak/shutterstock

Waste-to-fuel plants produce fuels from the combustible (energy-rich) materials found in waste from households and industry. Suitable materials include non-recyclable papers, plastics, wood waste and textiles. All of these typically end up in landfill.

These materials are preferably sourced from existing recycling facilities, which currently have to throw out contaminated matter that can’t be recycled.

Solid waste fuels are produced to specified qualities by different treatment methods. These include drying, shredding, and compressing into briquettes or fuel pellets. Fuels can be specifically tailored for ease of transportation and for different uses where industrial heat is required. This make them suitable alternatives to fossil fuels.

What are solid waste fuels used for?

As a replacement for coal and gas, solid waste fuel can be burned to generate electricity with a smaller carbon footprint than fossil fuels.

In addition to the power sector, other industries requiring high-temperature heat use solid waste fuels – for example, in cement works in Australia and around the world. There may also be scope to expand their use to other energy-intensive industries, such as metals recycling and manufacturing industrial chemical products.

Fuel pellets made from waste can be burned for energy. tchara/shutterstock What are the key benefits?

The primary environmental benefit of solid waste fuel comes from the reductions in landfill emissions and fossil fuel use.

Biodegradable carbon sources decompose in landfill, creating methane. This is a greenhouse gas with a warming potential 25 times that of carbon dioxide. Technology already exist for capturing and converting landfill gases to energy, but waste-to-fuel is a complementary measure that limits landfill in the first instance.

Waste-derived fuel can also have a smaller carbon footprint than fossil fuels. This depends on the carbon content of the fuel, and whether it is derived from biological sources (such as paper, wood or natural fibres). Even though carbon dioxide is emitted when the fuel is burned, this is partly offset by the carbon dioxide captured by the plants that produced the materials in the first place.

In these cases, solid waste fuels are eligible for renewable energy certificates. More advanced closed-loop concepts achieve even better carbon balances by capturing the carbon dioxide released when the fuel is used. This can used for other processes that require carbon dioxide as an input, such as growing fruit and vegetables.

Further environmental benefits can come from the management of problem wastes such as treated timbers, car tyres, and e-plastics. Converting them into fuel prevents the leaching of harmful substances into the environment, and other potential problems.

Arma banchang/shutterstock What are the challenges?

Communities are legitimately concerned about energy recovery from waste owing to public health risks. Without appropriate emission control, burning solid fuel can release nitrous oxides, sulphur dioxides, particulate matter and other harmful pollutants. But, with solid regulation and the best available pollution-control technology, these emissions can be managed.

The recycling industry is also worried that energy recovery has the potential to undermine existing recycling by diverting waste flows. Famously, solid waste fuel is so important to Sweden it actually imports garbage from other European countries.

These challenges point to the importance of investing in the appropriate infrastructure at the right size, and creating regulations that balance the needs of existing recycling processes. With careful planning, waste-to-fuel can be an important part of a broad strategy for transitioning towards a zero-landfill future.

Nick Florin receives funding from CSIRO and Federal and State government agencies.

Ben Madden receives funding from Federal and State government agencies

Most of the gas that is ‘cheap’ to extract has been or is being extracted, so ensuring more supply won't bring the price of gas down.

The Federal Coalition's refusal to tackle climate change means we need to see more political leadership from state governments such as Victoria. 

Greenough River, the first large-scale solar farm to be built in Australia, is going ahead with plans to quadruple in size.

FAST CHANGE: The Antarctic Peninsula is not only getting warmer, it's getting dramatically greener with a sharp increase in plant growth over the past 50 years.

Would you like to be paid to use less electricity? That's the idea behind a new trial of a concept known as "demand response", launched by the energy market operator AEMO and the renewable energy agency ARENA

A new approach endorsed by a meeting of the Commonwealth secretariat overnight would cut carbon emissions while still accelerating economic growth and development.

Many banks are worried that coal investments could be left stranded on their asset books. Rasta777/Shutterstock.com

Despite the overwhelming evidence that fossil fuels are killing the Great Barrier Reef and making many extreme weather events worse; despite the emphatic thumbs-down from the finance sector; and despite the growing awareness of the serious health impacts of coal, the proposed Carmichael coal mine staggers on, zombie-like, amid reports it has been offered a deferment of A$320 million in royalty payments.

A new Climate Council report, Risky Business: Health, Climate and Economic Risks of the Carmichael Coalmine, makes an emphatic case against development of the proposed mine, or of any other coal deposits in Queensland’s Galilee Basin, or indeed elsewhere around the world.

Burning coal is a major contributor to climate change. Australia is already reeling from the escalating impacts of a warming climate. Heatwaves and other extreme weather events are worsening. The Great Barrier Reef has suffered consecutive mass bleaching events in 2016 and 2017. Climate change is likely making drought conditions worse in the agricultural belts of southwest and southeast Australia. Our coastal regions are increasingly exposed to erosion and flooding as sea level rises.

If we are to slow these disturbing trends and stabilise the climate at a level with which we might be able to cope, only a relatively small amount of the world’s remaining coal, oil and gas reserves can actually be used.

The majority must be left unburned in the ground, without developing vast new coal deposits such as those in the Galilee Basin.

On budget

The amount of fossil fuels we can burn for a given temperature target (such as the 1.5℃ and 2℃ targets of the Paris climate agreement) is known as the “carbon budget”.

To give ourselves just a 50% chance of staying within the 2℃ Paris target, we can burn only 38% of the world’s existing fossil fuel reserves. When this budget is apportioned among the various types of fossil fuels, coal is the big loser, because it is more emissions-intensive than other fuels. Nearly 90% of the world’s existing coal reserves must be left in the ground to stay within the 2℃ budget.

When the carbon budget is apportioned by region to maximise the economic benefit of the remaining budget, Australian coal in particular is a big loser. More than 95% of Australia’s existing coal reserves cannot be burned, and the development of new deposits, such as the Galilee Basin, is ruled out.

The health case

Exploiting coal is very harmful to human health, with serious impacts all the way through the process from mining to combustion. Recently the life-threatening “black lung” (coal workers’ pneumoconiosis) has re-emerged in Queensland, with 21 reported cases. Across Australia, the estimated costs of health damages associated with the combustion of coal amount to A$2.6 billion per year.

In India, the country to which coal from the proposed Carmichael mine would likely be exported, coal combustion already takes a heavy toll. An estimated 80,000-115,000 deaths, as well as 20 million cases of asthma, were attributed to pollutants emitted from coal-fired power stations in 2010-11. Up to 10,000 children under the age of five died because of coal pollution in 2012 alone.

Compared with the domestic coal resources in India, Carmichael coal will not reduce these health risks much at all. Galilee Basin coal is of poorer quality than that from other regions of Australia. Its estimated ash content of about 26% is double the Australian benchmark.

This is bad news for children in India or in any other country that ends up burning it.

The economics

The economic case for the Carmichael mine doesn’t stack up either. Converging global trends all point to rapidly reducing demand for coal.

The cost of renewable energy is plummeting, and efficient and increasingly affordable storage technologies are emerging. Coal demand in China is dropping as it ramps up the rollout of renewables. India is moving towards energy independence, and is eyeing its northern neighbour’s push towards renewables.

All of these trends greatly increase the risk that any new coal developments will become stranded assets. It’s little wonder that the financial sector has turned a cold shoulder to the Carmichael mine, and Galilee Basin coal development in general. Some 17 banks worldwide, including the “big four” in Australia, have ruled out any investment in the Carmichael mine.

From any perspective – climate, health, economy – the proposed mine is hard to justify. And yet the project keeps on keeping on.

Hilary Bambrick has previously received funding from the National Health and Medical Research Council, the Victorian and NSW Governments, the United Nations Development Programme, and the World Health Organization. She sits on the research committee of The Australia Institute.

Will Steffen 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.

Brown hares and hunting | Water in Bagno Vignoni | 35mm film canisters | Letter from the Tories | Granny Seaside and Granny Cat

A repeal of the 2004 Hunting Act would accelerate the demise of our iconic brown hares, already listed in 2011 for potential extinction by 2050 (May pledges free vote on hunting, 10 May). One third of the hunts (with dogs) in England and Wales target these declining hares, not foxes. The act outlaws hare coursing, but a repeal would further encourage this intrusive and destructive activity, already so distressing to farmers and problematic to police forces countrywide.
John Rimington
Technical liaison officer, Hare Preservation Trust

Related: Washing your hair with mineral water or champagne – what lengths would you go to?

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Whether or not the US is involved in global talks, the US will also feel the impacts of climate change.

Nasa is seeking the best ideas for experiments to fly on a mission that will land on Jupiter's moon Europa.

Small but unstoppable increases will double frequency of extreme water levels with dire consequences, say scientists

Small but inevitable rises in sea level will double the frequency of severe coastal flooding in most of the world with dire consequences for major cities that sit on coastlines, according to scientists.

The research takes in to account the large waves and storm surges that can tip gradually rising sea levels over the edge of coastal defences. Lower latitudes will be first affected, in a great swath through the tropics from Africa to South America and throughout south-east Asia, with Europe’s Atlantic coast and the west coast of the US not far behind.

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Recycling Association chief cites crisp brand as one of worst examples of multiple materials being used in single product

Product designers need to retreat from “the Pringles factor” in order to make their packaging more recyclable, an environmental expert has said.

Simon Ellin, the chief executive of the Recycling Association, which represents recyclers, pointed to the snack tube as a prime example of the failure to consider recycling in design – and listed a range of other offenders from Lucozade Sport drinks to whisky packaging.

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