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The Australian government has agreed to invest almost $53 million in a north Tasmanian company that will upgrade its coal-fired kiln to burn wood “waste” and used tyres for cement manufacturing.
The Federal Minister for Climate Change, Chris Bowen, says this initiative will help decarbonise the Australian economy.
However, the science is clear: burning forest biomass, or so-called forest “waste” – which could include dead trees, understorey vegetation and fallen logs – generates large amounts of carbon emissions. It will likely also accelerate poor forest health.
The empirical evidence shows burning forest biomass to make concrete is poor climate policy, poor environmental and forest policy, and a poor use of taxpayer funds.
In line with climate change treaty commitments under the Paris Agreement, governments worldwide are working to decarbonise their economies in an attempt to limit global warming.
This includes finding alternative sources of clean energy to using fossil fuel. This is especially important for carbon-intensive, high-polluting industries, such as concrete production. While about 56% of concrete emissions come from processing clinker (the base material for cement), 39% come from using fossil fuel to generate heat, and 14% from electricity.
Unfortunately, forest biomass is increasingly being promoted as an energy source to replace fossil fuels, for example in the United Kingdom and Europe. Most forest biomass used to generate energy will likely be trees. And what is often referred to as “waste” is actually a critical part of the structure and composition of natural forests. For example, understorey vegetation and logs provide habitat for a wide range of animal species. They play an essential role in nutrient cycling, such as storing substantial amounts of carbon.
Whilst forest biomass is technically a renewable resource, as trees can be regrown after logging, it is not a source of clean energy. This is because about half of tree biomass is carbon (assuming a moisture content of 45%). Therefore, burning a tonne of wood generates roughly a tonne of carbon dioxide emissions. Importantly, up to 30% of carbon dioxide emissions are still in the atmosphere after 1,000 years.
Critically, there is a highly significant lag time, of decades to centuries, between carbon being instantaneously released from burning forest biomass and when it is removed from the atmosphere. These removals occur either by plant growth or through carbon making its way to the bottom of the ocean.
The lag time between burning forest biomass and tree regrowth is important because the increase in atmospheric carbon dioxide concentrations causes even more climate change. This is one of the key reasons why widespread burning of forest biomass in some European countries threatens their ability to meet Paris Agreement greenhouse gas reduction targets.
Furthermore, forest biomass has a far lower calorific content relative to coal. This means large quantities of forest material has to be burned to generate an equivalent amount of energy. This high demand for wood for biomass energy can contribute significantly to poor forest health.
Notably, Australia, along with many other governments, has committed to ending deforestation and degradation by 2030. This recognises the importance of forest carbon sequestration and storage in meeting climate targets and achieving the Paris Agreement goals.
The Tasmanian plan, that would see Cement Australia burn forest “waste” to generate energy, is far from an isolated case. There are well-developed plans for Verdant Earth Industries to reopen the former coal-fired Redbank Power Station in the Hunter Valley, in New South Wales, and generate energy by burning hundreds of thousands of tonnes of “wood waste” annually.
Much of this “waste” will likely be trees from forest and woodland regrowth, which are fundamental to the integrity of those ecosystems. This regrowth also provides habitat for a vast array of species, including a range of threatened species.
Biomass burning is frequently supported by native forest logging advocates because of structural issues in the industry. These issues include attempts to extract some financial return from an industry that is largely unprofitable. The native forest sector produces primarily low-value, high-volume commodities such as [woodchips and paper pulp], whereas plantation forest sector dominates high-value sawn wood products.
Similarly, state government forestry agencies have been unable to get market certification for wood products such as woodchips and pulpwood from bodies such as the Forest Stewardship Council. This is partly because the areas logged to produce wood products are often are home to a diverse range of plants and animals that may be threatened by logging.
We fully acknowledge the efforts being made to explore how emissions-intensive industries can be decarbonised, such as reducing the clinker content in cement.
However, Australian governments must stop using taxpayer money to subsidise projects that entail large-scale burning of forest and woodland biomass for industrial energy.
Alternative forms of energy, including concentrated solar power, will be important in this regard. Unlike forest biomass burning, these are both renewable and clean sources of energy.
A response was sought from Cement Australia.![]()
David Lindenmayer, Distinguished Professor of Ecology, Fenner School of Environment and Society, Australian National University and Brendan Mackey, Director, Griffith Climate Action Beacon, Griffith University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Whales and dolphins inhabit some of the largest and seemingly most pristine environments on Earth, from tropical coastlines to Antarctic waters. Yet even they cannot escape PFAS – persistent “forever chemicals” that leak from our homes, factories and waterways into the sea.
Forever chemicals are the secret ingredients in our non-stick pans, waterproof jackets and stain-resistant carpets. These chemicals belong to a group of more than 1,400 compounds known as PFAS (per- and polyfluoroalkyl substances). They enter the environment through manufacturing waste, industrial runoff, wastewater treatment plants and firefighting foams. But once these chemicals escape our homes and factories, they become almost impossible to get rid of. Washed into waterways, they make their way to the sea.
Small organisms absorb them from the water, fish eat those organisms and larger predators eat the fish. At each step, the chemical load increases. As top predators, whales and dolphins can end up with very high levels in their bodies. Not even deep-diving species living and feeding far from humans are safe.
In our new research, we found PFAS concentrations in cetaceans have increased globally since 2000. Animals in the Pacific Ocean were the most contaminated, with humpback dolphins showing the highest PFAS concentrations.
These mammals are sentinels of ocean health. They sit high in the food web, live for many years and are exposed to pollution across large areas of the ocean. When whales and dolphins show signs of chemical exposure, it tells us something is wrong in the wider marine ecosystem.
Many of these chemicals have been in use for decades. Their sheer durability and ability to resist heat, oil and water make them very useful.
Scientists have grown increasingly concerned about them because they persist for decades and build up over time in our own bodies, as well as in wildlife and the broader environment.
The key concern is what these chemicals may be doing to the animals that accumulate them.
Research in humans and laboratory animals links PFAS to immune suppression, hormonal changes, reproductive problems and developmental effects. But we don’t yet have enough research to understand how different PFAS compounds and levels of exposure affect health.
Understanding these impacts in whales and dolphins is harder still. Marine mammals are long-lived, highly mobile and exposed to many human-made problems at once, from climate change to noise pollution to other contaminants.
Even so, there are warning signs. Some dolphin studies have reported changes in immune-related markers associated with PFAS exposure.
For humans, testing PFAS levels is usually done with a blood test. It is not as simple for whales and dolphins.
It is extremely difficult to take blood samples from large marine mammals in the wild. Scientists often rely on tissue samples from dead animals, particularly from the liver and kidney where many PFAS compounds tend to accumulate. These samples are analysed in specialised laboratories capable of detecting tiny concentrations of individual PFAS compounds.
This way, scientists have been measuring PFAS in whales and dolphins for decades. Each study added another piece to the puzzle, showing these chemicals were present in different species, populations and oceans.
Our study took a step back and looked at the global picture.
We compiled PFAS data from cetaceans worldwide, focusing on liver samples because they are the most commonly available tissue type, allowing us to compare studies across species and regions.
We found PFAS contamination differed substantially across species, location, sex, age and time.
The highest concentrations tended to be found in coastal dolphins and porpoises, suggesting animals living near urban and industrial areas face greater exposure.
Cetaceans in the Pacific had higher levels than other oceans. This is likely due to high industrial activity and the extent of historical PFAS production in coastal regions.
Female whales and dolphins can transfer forever chemicals during pregnancy and nursing. This means their calves can be exposed to concerning levels of PFAS at a very early age.
Males often end up with higher levels than females overall, as they cannot transfer these chemicals to their young.
There are some large gaps in the global dataset we collated, which means we don’t fully know the extent of PFAS contamination in cetaceans off India, Indonesia and parts of Africa.
While important questions remain about the effects of forever chemicals on whales and dolphins, the widespread contamination we observed is a real concern. We need to continue monitoring while strengthening regulations and working to reduce PFAS flows into the environment.
History shows global action on harmful chemicals works. After it became clear Earth’s protective ozone layer was being eaten away, nations agreed to phase out the chemicals responsible. The ozone layer is now recovering.
The European Union moved to ban some PFAS compounds 20 years ago. Our study found lower levels of some legacy PFAS compounds in the Mediterranean Sea, a pattern that may reflect the effects of regulation. This is positive, but not sufficient given overall PFAS levels in whales and dolphins have increased globally over time. The EU is now moving to better regulate this class of forever chemicals.
Forever chemicals are one of the defining pollution challenges of our time. The more we understand how these chemicals accumulate in whales and dolphins, the better equipped we will be to reduce future contamination and protect marine ecosystems.
What ends up in the ocean does not simply disappear. And neither do PFAS.
This article is based on collaborative research that also included Lavinia Stokes (University of Wollongong), Jesuina de Araujo (National Measurement Institute) and Gavin Stevenson (National Measurement Institute).![]()
Katharina J. Peters, Lecturer in Biological Sciences, University of Wollongong; Frédérik Saltré, Senior Lecturer in Ecology and Biogeography, University of Technology Sydney; Australian Museum, and Karen Stockin, Professor of Marine Ecology, Te Kunenga ki PÅ«rehuroa – Massey University
This article is republished from The Conversation under a Creative Commons license. Read the original article.