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For a second day, Paris is cutting car numbers according to odd or even licence plates. Do such schemes work?

The Cassini spacecraft has sent back the first views from its new orbit around Saturn.

Cuts made to workforce at home and overseas despite ministers saying climate diplomacy should be a top priority

The UK has cut the number of Foreign Office staff working on climate change, despite ministers arguing the issue should be a top foreign policy priority.

The Liberal Democrats said it was “appalling” and sent “the wrong signals” to the world, after a minister revealed the figures in a recent parliamentary answer.

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Poultry keepers have been told to keep their birds inside to protect them from avian flu in Europe.

Campaigners hail announcement that funding for air quality measures will rise to £875m over the next five years

Campaigners, health charities and and neighbourhood groups have welcomed plans by the London mayor, Sadiq Khan, to more than double funding to clean up the capital’s dirty air.

London is one of the most polluted of dozens of cities in the UK that breach EU standards on nitrogen dioxide (NO2), a toxic gas caused by diesel vehicles. Air pollution has been linked to nearly 9,500 premature deaths in the city each year.

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Scientists formerly thought associative memory was the domain of humans and other animals

Extreme weather is driving up uninsured losses and insurers must use investments to fund global warming resilience, says study

The ability of the global insurance industry to manage society’s risks is being threatened by climate change, according to a new report.

The report finds that more frequent extreme weather events are driving up uninsured losses and making some assets uninsurable.

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It’s a rare week when natural resource management policy penetrates the national news cycle not once, but twice.

Nonetheless, last Thursday the federal government struck a deal with the Greens to increase funding to Landcare programs by A$100 million in exchange for their support on other matters. No one quite seems to know yet how this money will be spent – presumably in ways that support the thousands of volunteer community Landcare groups dotted around Australia.

Then on Sunday, the Australian Financial Review reported that the government will abolish the Green Army program as part of its mid-year budget update later this month.

Introduced in 2014 as a signature policy under the then prime minister, Tony Abbott, the Green Army aimed to mobilise 15,000 young and unemployed people to work on conservation projects and receive complementary training. Axing the program would deliver budget savings of around A$350 million.

Abbott took to Facebook on Monday to criticise the move. His main concern seems to be the implication that the Greens’ policy priorities are more important than the Coalition’s. That’s a bad look, he argues, for a “centre-right government”.

Yet the move would arguably be very much in keeping with centre-right values. By reinvigorating Landcare’s model of personal responsibility and self-regulation, the government could reduce pressure to regulate land use or to pay landholders financial incentives to improve their environmental management.

But consistency with any particular political philosophy is not the issue here. The hyper-polarised political landscape of recent years, particularly on environmental policies, encourages parties to differentiate on any grounds they can. Thus, the cross-party support long enjoyed by Landcare can perversely work against it. Incoming governments believe they need new programs to claim as their own, diverting attention and resources from those already in place.

The A$484 million cut to Landcare in the 2014 budget needs to be remembered in this context. Both Coalition and Labor governments have made changes over the years that either reduced the financial support available to community Landcare groups, or imposed more top-down modes of decision-making.

The 2015 Senate inquiry into the National Landcare Program revealed considerable community concern about the impacts of budget cuts on Landcare’s activities and on private commitment to natural resource management. Every dollar of public money invested in Landcare is believed to leverage between A$2.60 and A$12.00 of community and landholder investment.

When the Green Army was launched, many people questioned whether it would deliver this kind of value for money. With a three-year review of the Green Army due for release early next year (subject to ministerial approval), we might have expected to see some answers.

So why is the Green Army is being cut before the review? Perhaps the government is sparing itself the embarrassment of defending a program that is failing to meet its objectives. Perhaps, despite the critics, the findings would have been positive and the government is avoiding having to explain why the Green Army is being killed off anyway. Perhaps it’s just looking for easy budget savings.

Strategic plan?

Whatever the motivation, the biggest concern is the absence of a strategic and coherent approach to natural resource management policy in Australia. Major program changes are being made with limited consultation and transparency, and precious little evidence of planning.

At the same time, some policies and programs appear to be working at cross purposes. For example, tree clearing is increasing in much of Australia at the same time that some landholders are being paid through the Emissions Reduction Fund to conserve native vegetation.

Questions need to be asked about the genuine impacts of existing policy, about the way in which regulations intersect with voluntary programs, and about coordination between Commonwealth and state governments, among other issues.

The recent Senate inquiry into Landcare called for long-term investment and stability in natural resource management programs. Achieving this will require a return to genuine cross-party support coupled with broader community and industry support. The key to achieving this, I suspect, is less wheeling and dealing among political parties and more consultation and planning with all interested stakeholders.

It might be time to consider a white paper process to inform the next phase of natural resource management policy. At least that would give us some confidence policy is not being decided on the run.

Stewart Lockie receives funding from the Australian Research Council, the Department of Foreign Affairs and Trade and Mission Australia.

Duncansby Head, John O’Groats As the wind rises the timbre alters and I struggle to place it – the howling of wolves, infants wailing, dissonant chords on a pipe organ?

At the far north-eastern corner of the British mainland the land rises up from the sea like cake from a tin: edges are clean and sharp, layers of sediment cut through the red sandstone like jam.

The sun is out, the air is still, and the residents are busy making their preparations for winter in this rare break in the weather.

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The unassuming dusky hopping mouse. Ben Moore

You should stop skylarking about with those bloody desert mice and try and stop those woody weeds. I could see clear through that paddock in the ‘60s. Now look at it. That scrub costs us tens of thousands of dollars in lost fodder and it’s almost impossible to muster the livestock.

That blunt assessment of our research, first offered by a local farmer in Australia’s arid rangelands almost seven years ago, raised an irresistible question for us as field ecologists. Why are Australia’s (and many others around the world) grasslands becoming woodier?

It certainly was a question worth asking. Shrub encroachment – an increase in the cover of woody shrubs in areas once dominated by grasses – is not just an issue in Australia.

In two recent papers published in the journals Ecography and the Journal of Animal Ecology, we looked at one key reason why trees are invading grasslands, and how we could stop them. And it all comes down to tiny desert mice.

Shrub invasion

“Invasive native vegetation”, as bureaucrats call it, is a major problem for livestock producers in drylands throughout the world. This is because the shrubs compete for space and light with the grasses needed to feed their cattle and sheep.

Shrub encroachment ‘inside’ the Dingo Fence. Dr Ben Moore

It is a hard problem to tackle. Clearing and fire are the most common methods of controlling woody shrubs. But these methods are laborious and often hard to implement on large scales.

Removing shrubs is also contentious because these are typically native species that provide important habitat for wildlife. The New South Wales parliament’s controversial relaxation in November of regulations governing vegetation clearing were designed partly to allow farmers to remove invasive native vegetation.

What’s going on?

The causes for the spread are complex and poorly understood. Shrub encroachment is often attributed to overgrazing by livestock, which favours the growth of shrubs over grasses. It has also been linked to a reduction in bushfires that wipe out the shrubs and an increase in atmospheric carbon dioxide, which can promote their growth.

However, we suspected another important factor could be at play. And it was those little desert mice that provided us with a big clue – and a possible solution.

Since European settlement, livestock grazing and the introduction of foxes, feral cats and rabbits have decimated Australia’s native mammals, especially in arid and semi-arid areas.

The bilbies, bettongs, native rodents and other small mammals that became rare or extinct across much of the continent in the early 20th century once played essential roles in Australian ecosystems, by shifting vast amounts of soil and consuming vegetation and seeds.

Historical accounts suggest that shrub encroachment quickly followed European settlement and mammal extinctions in many areas. This coincidence led us to ask: could the loss of native mammals be making Australia’s drylands woodier?

Hopping to it

To answer this question, we went to the northwest corner of NSW. Here the Dingo Fence marks the border with Queensland and South Australia.

The Dingo Fence. Ben Moore

We wanted to know whether the local extinction of a native mammal, the dusky hopping mouse, which eats shrub seeds and seedlings, would allow more shrubs to grow. The Dingo Fence was the perfect study site because dusky hopping mice are common on the northwest side, “outside” the fence, where dingoes are present.

Dingoes keep fox numbers down, which are the mouse’s major predator. However, dusky hopping mice are rare on the “inside” of the fence (the NSW side), where dingoes are less common and foxes roam.

We first used historical aerial photographs to show that shrub cover was consistently higher inside the dingo fence (rodents rare) than outside (rodents common). We then did field surveys, which showed that the numbers of shrubs, their seedlings and their seeds were greater where rodents were rare.

We also showed that dusky hopping mice were major consumers of shrub seeds and capable of keeping the numbers of shrub seeds in the soil down.

Fieldwork in the Strzelecki Desert. Dr Ben Moore Going wild again

These results are exciting because they suggest that the loss of native mammals such as the dusky hopping mouse may be an important and overlooked driver of shrub encroachment, not only in arid Australia but also globally.

Perhaps more exciting, however, is how we can apply our work. Our research suggests that “rewilding” drylands by re-establishing rodents and other native mammal species that eat shrub seeds and seedlings, such as bettongs and bilbies, could curb the shrub invasion.

Although an abstract and even controversial idea, rewilding of native mammals would provide a long-term solution to a problem that has affected pastoralists for more than a century.

Further, it would represent a natural and cost-effective strategy with enormous benefits for the conservation of imperilled native mammals.

Before we can do so, we have to control foxes and feral cats across vast areas, which is no small feat. However, the economic and conservation potential make it an approach that is well worth taking seriously.

Mike Letnic has received funding from the Hermon Slade Foundation and Australian Research Council.

Christopher Edward Gordon 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.

NX Fusion Plus™ extends energy output and duration for solar power plants

An unseasonal dip in sea ice growth helped November set a record low — the seventh month to do so this year, also a record.

How much battery storage is needed for a grid relying on wind and solar for nearly all its electricity needs? Not as much as many think, and a CSIRO study says much of it will be provided by households installing battery storage to help reduce their bills.

This week in climate and energy policy, we are left in no doubt where power lies in Conservative government decision making.

Research has cast doubt on a UN-backed project to reduce pollution-induced illness in the world's poorest children by providing 100 million homes with a smoke-free stove.

Has Adani been promised a royalty holiday? Will it pay for its water use? These and more questions for the Turnbull government.

The recalcitrance of reactionary ideologues to carbon pricing and climate policies only increases risks to energy security, prices and community stability.

Having locked in 100 per cent renewable energy for its electricity needs, the ACT is now turning to zero emissions for transport.

Wangan and Jagalingou opponents, who say project would override native title on most of their land, dispute Queensland mining minister’s approval of leases

Traditional owners have launched a fresh legal challenge to Adani’s proposed Carmichael mine, declaring they would go all the way to the high court to stand as the last “line of defence” against the contentious project.

Wangan and Jagalingou opponents of the mine on Tuesday went to the Queensland court of appeal to dispute the state mining minister’s approval of Adani’s mining leases.

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Insurance experts warn of a $100bn global "protection gap" due to increased climate change risks.