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Logging Native Forests Worsened Australia's Wildfires, Scientists Say

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Logging Native Forests Worsened Australia's Wildfires, Scientists Say
Cut timber being loaded for transportation to a manufacturing plant in Gympie, Queensland, Australia on July 17, 2013. Auscape / Universal Images Group via Getty Images

Australia's unprecedented wildfires that raged for months and destroyed millions of acres were likely made worse by industrial logging of native forests, according to a new commentary from five scientists published in Nature Ecology & Evolution.



The group of five senior Australian scientists from the Australian National University, Macquarie University and the University of Queensland said that logging native forests makes fire more severe and they are calling for a clearer assessment about how land management and forestry practices add to the risk of wildfires, according to The Guardian.

"Logging causes a rise in fuel loads, increases potential drying of wet forests and causes a decrease in forest height," said James Watson, a professor at the University of Queensland and an author on the paper in a university statement. "It can leave up to 450 tonnes of combustible fuel per hectare close to the ground — by any measure, that's an incredibly dangerous level of combustible material in seasonally dry landscapes. By allowing these practices to increase fire severity and flammability, we undermine the safety of some of our rural communities.

"It affects wildlife too by creating habitat loss, fragmentation and disturbance for many species, with major negative effects on forest wildlife," he added.

They say that the contribution of logging to bushfires needs greater scrutiny, and there should be more public awareness about the compelling links between wildfires and the climate crisis, according to The Sydney Morning Herald.

They also note that while most global emissions and pollution is out of the country's control, Australians have full authority over how their own land is managed.

"The first is to prevent logging of moist forests, particularly those close to urban areas," said lead author David Lindenmayer, a professor at Australia National University, in a statement. "We must also reduce forest fragmentation by proactively restoring some previously logged forests. In the event of wildfires, land managers must avoid practices such as 'salvage' logging — or logging of burnt forests — which severely reduces recovery of a forest."

Last week, VicForests Chief Executive Officer Monique Dawson criticized professor Lindenmayer, an internationally regarded ecologist, saying in a letter to the Goongerah Environment Centre that the agency "does not accept his published opinions."

Lindenmayer said he was taking legal advice about the remarks in the letter, as The Guardian reported. He added that her comments reflected an organization that was unscientific and did not rely on evidence to manage forests.

In fact, as The Sydney Morning Herald reported, despite warning from environmentalists that forests and wildlife are still very fragile, VicForests last week revealed plans to log 3500 hectares of forests burnt during the catastrophic summer fires in the next few years.

The paper says industry data showed that some 161 million cubic meters of native forest was logged between 1996 and 2018.

"Beyond the direct and immediate impacts on biodiversity of disturbance and proximity to disturbed forest, there is compelling evidence that Australia's historical and contemporary logging regimes have made many Australian forests more fire prone and contributed to increased fire severity and flammability," the scientists wrote, as The Guardian reported.

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By Tara Lohan

Warming temperatures on land and in the water are already forcing many species to seek out more hospitable environments. Atlantic mackerel are swimming farther north; mountain-dwelling pikas are moving upslope; some migratory birds are altering the timing of their flights.

Numerous studies have tracked these shifting ranges, looked at the importance of wildlife corridors to protect these migrations, and identified climate refugia where some species may find a safer climatic haven.

"There's a huge amount of scientific literature about where species will have to move as the climate warms," says U.C. Berkeley biogeographer Matthew Kling. "But there hasn't been much work in terms of actually thinking about how they're going to get there — at least not when it comes to wind-dispersed plants."

Kling and David Ackerly, professor and dean of the College of Natural Resources at U.C. Berkeley, have taken a stab at filling this knowledge gap. Their recent study, published in Nature Climate Change, looks at the vulnerability of wind-dispersed species to climate change.

It's an important field of research, because while a fish can more easily swim toward colder waters, a tree may find its wind-blown seeds landing in places and conditions where they're not adapted to grow.

Kling is careful to point out that the researchers weren't asking how climate change was going to change wind; other research suggests there likely won't be big shifts in global wind patterns.

Instead the study involved exploring those wind patterns — including direction, speed and variability — across the globe. The wind data was then integrated with data on climate variation to build models trying to predict vulnerability patterns showing where wind may either help or hinder biodiversity from responding to climate change.

One of the study's findings was that wind-dispersed or wind-pollinated trees in the tropics and on the windward sides of mountain ranges are more likely to be vulnerable, since the wind isn't likely to move those dispersers in the right direction for a climate-friendly environment.

The researchers also looked specifically at lodgepole pines, a species that's both wind-dispersed and wind-pollinated.

They found that populations of lodgepole pines that already grow along the warmer and drier edges of the species' current range could very well be under threat due to rising temperatures and related climate alterations.

"As temperature increases, we need to think about how the genes that are evolved to tolerate drought and heat are going to get to the portions of the species' range that are going to be getting drier and hotter," says Kling. "So that's what we were able to take a stab at predicting and estimating with these wind models — which populations are mostly likely to receive those beneficial genes in the future."

That's important, he says, because wind-dispersed species like pines, willows and poplars are often keystone species whole ecosystems depend upon — especially in temperate and boreal forests.

And there are even more plants that rely on pollen dispersal by wind.

"That's going to be important for moving genes from the warmer parts of a species' range to the cooler parts of the species' range," he says. "This is not just about species' ranges shifting, but also genetic changes within species."

Kling says this line of research is just beginning, and much more needs to be done to test these models in the field. But there could be important conservation-related benefits to that work.

"All these species and genes need to migrate long distances and we can be thinking more about habitat connectivity and the vulnerability of these systems," he says.

The more we learn, the more we may be able to do to help species adapt.

"The idea is that there will be some landscapes where the wind is likely to help these systems naturally adapt to climate change without much intervention, and other places where land managers might really need to intervene," he says. "That could involve using assisted migration or assisted gene flow to actually get in there, moving seeds or planting trees to help them keep up with rapid climate change."


Tara Lohan is deputy editor of The Revelator and has worked for more than a decade as a digital editor and environmental journalist focused on the intersections of energy, water and climate. Her work has been published by The Nation, American Prospect, High Country News, Grist, Pacific Standard and others. She is the editor of two books on the global water crisis. http://twitter.com/TaraLohan

Reposted with permission from The Revelator.

An illustration depicts the extinct woolly rhino. Heinrich Harder / Wikimedia Commons

The last Ice Age eliminated some giant mammals, like the woolly rhino. Conventional thinking initially attributed their extinction to hunting. While overhunting may have contributed, a new study pinpointed a different reason for the woolly rhinos' extinction: climate change.

The last of the woolly rhinos went extinct in Siberia nearly 14,000 years ago, just when the Earth's climate began changing from its frozen conditions to something warmer, wetter and less favorable to the large land mammal. DNA tests conducted by scientists on 14 well-preserved rhinos point to rapid warming as the culprit, CNN reported.

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The study, published in Current Biology, notes that the rhino population stayed fairly consistent for tens of thousands of years until 18,500 years ago. That means that people and rhinos lived together in Northern Siberia for roughly 13,000 years before rhinos went extinct, Science News reported.

The findings are an ominous harbinger for large species during the current climate crisis. As EcoWatch reported, nearly 1,000 species are expected to go extinct within the next 100 years due to their inability to adapt to a rapidly changing climate. Tigers, eagles and rhinos are especially vulnerable.

The difference between now and the phenomenon 14,000 years ago is that human activity is directly responsible for the current climate crisis.

To figure out the cause of the woolly rhinos' extinction, scientists examined DNA from different rhinos across Siberia. The tissue, bone and hair samples allowed them to deduce the population size and diversity for tens of thousands of years prior to extinction, CNN reported.

Researchers spent years exploring the Siberian permafrost to find enough samples. Then they had to look for pristine genetic material, Smithsonian Magazine reported.

It turns out the wooly rhinos actually thrived as they lived alongside humans.

"It was initially thought that humans appeared in northeastern Siberia fourteen or fifteen thousand years ago, around when the woolly rhinoceros went extinct. But recently, there have been several discoveries of much older human occupation sites, the most famous of which is around thirty thousand years old," senior author Love Dalén, a professor of evolutionary genetics at the Center for Paleogenetics, said in a press release.

"This paper shows that woolly rhino coexisted with people for millennia without any significant impact on their population," Grant Zazula, a paleontologist for Canada's Yukon territory and Simon Fraser University who was not involved in the research, told Smithsonian Magazine. "Then all of a sudden the climate changed and they went extinct."

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For example, she says that locally owned businesses can lead the local clean energy economy and create new jobs in underserved communities.

"We really need to think about … connecting climate and energy with other issues that people wake up every day really worried about," she says, "whether it be jobs, housing, transportation, health and well-being."

To maximize that potential, she says the energy sector must have more women and people of color in positions of influence. Research shows that leadership in the solar industry, for example, is currently dominated by white men.

"I think that a more inclusive, diverse leadership is essential to be able to effectively make these connections," Stephens says. "Diversity is not just about who people are and their identity, but the ideas and the priorities and the approaches and the lens that they bring to the world."

So she says by elevating diverse voices, organizations can better connect the climate benefits of clean energy with social and economic transformation.

Reposted with permission from Yale Climate Connections.