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A new study estimates there are just 7,100 now left in the wild as the wide-ranging mammal faces growing conflict with humans.

Calls for culls always surge after attacks by ‘salties’ but it’s their habitat not humans that will decide their numbers

For the people of Australia’s tropical north, a wary coexistence with crocodiles is a fact of life.

Protected for more than four decades after being hunted to near extinction, the ancient reptile – on the credible numbers that are available – has staged a remarkable recovery.

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UK scientists have decoded the genome of the ash in the fight against a devastating plant disease.

Ground-breaking genetic analysis shows native trees may be more resistant than Danish ones to the deadly fungus that has spread across Europe

British ash trees seem to have better resistance against a deadly fungus which is devastating trees across Europe, according to research which has decoded the DNA of the species for the first time.

The ash dieback fungus has spread rapidly since it first arrived in England in 2012 and the latest data shows it is now found in more than half of the country. It has already affected 90% of trees in Denmark and threatens to all but wipe out ash trees, one of Europe’s most common trees.

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A year after severe floods in wake of Storm Desmond, John Krebs says ministers still have no coherent long-term plan to deal with it

Major flooding in the UK is now likely to happen every year but ministers still have no coherent long-term plan to deal with it, the government’s leading adviser on the impacts of climate change has warned.

Boxing Day in 2015 saw severe floods sweep Lancashire and Yorkshire, just weeks after Storm Desmond swamped Cumbria and parts of Scotland and Wales. The flooding, which caused billions of pounds of damage, led to the government publishing a review in September which anticipates 20-30% more extreme rainfall than before.

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The 200kg mammal had to be tranquillised after climbing on to a car in suburban Launceston

A giant fur seal that spent Boxing Day wandering suburban Tasmania’s streets will be released back into the wild.

Police, and parks and sildlife officers spent much of Monday morning trying to capture the seal, which took a stroll along the streets in Newstead, Launceston – at one point managing to climb on to a car.

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River Welland, Lincolnshire This path alone is a find. It’s like walking through a ribcage

Following the river, I got here. Not waterborne as I might have liked; it’s not a day for the canoe. Instead I looked at the map, for new places where the river touches the land. How many find country by looking near roads? But roads go where we wanted them to: the river goes where it has always gone.

One place caught my eye, a place called Spring Woods. Not for spring like the season, but for a series of springs rising on the river’s northern bank, away from roads on a bend where the Welland leaves Stamford, thins, and starts to slink.

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A selection of the best science and environment reads this year.

We search for bum-breathing turtles in the Mary River in Queensland; bait foxes in the remote and rugged Burrup Peninsular; and join citizen scientists looking for fungi in the Tarkine Forest.

Conservationists say about 80 creatures in zoos and private collections hold key to re-establishment of the endangered species

Fewer than 100 Scottish wildcats are now believed to exist in the wild, say leading experts, with no evidence of any decent sized populations anywhere in the country.

While it had been hoped up to 300 may still survive, recent extensive monitoring suggests a lower figure, with individuals or small groups clinging on in isolated and fragmented pockets.

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Swimmers urged to stick to patrolled beaches after high number of sightings at favourite holiday spots

About 30 sharks were sighted along Victorian beaches on Christmas Day, prompting Fisheries Victoria to urge people to swim at patrolled beaches.

The Life Saving Victoria helicopter spotted 12 sharks off Anglesea beach, a favourite holiday spot on the Great Ocean Road. About 13km south, between 15 and 20 sharks were sighted at Fairhaven beach.

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It's all fun and games until someone cops a fine. Dmitry Kalinovsky/shutterstock.com

Whether a beginner, a serious aviation enthusiast, or just a fan of gadgets, many of you will have received drones as Christmas gifts. Unmanned aerial vehicles (UAVs) have surged in popularity and affordability in recent years, and there’s no doubt that recreational drone use is on the rise as a result.

But not all recreational drone users know the law – or if they do, they don’t appear to be following it. There has been a string of near misses between drones and other aircraft, and other cases of irresponsible use.

Only last month, a recreational drone user was investigated by Australia’s Civil Aviation Safety Authority (CASA) after evidently flying a drone over a crowded Bunnings carpark to pick up a sausage at a sausage sizzle.

In the runup to Christmas, UN aviation officials this month warned anyone getting a drone to make sure they learn how to operate it safely. So if Santa has brought you one, here’s what you need to know.

Get on board

In Australia, if you want to fly your drone for fun, you don’t need CASA’s approval – as long as you follow the authority’s simple safety rules. Recreational drone operators must comply with CASA’s rules (known as its standard operating conditions).

You must only fly your drone within visual line of sight – that is, where you are able to see the drone with your own eyes, rather than with the help of binoculars or a telescope, for example. What’s more, you can only fly in visual meteorological conditions, which generally means no night flights.

In most Australian cities, you can only fly your drone up to a maximum altitude of 120 metres – most of this airspace is considered controlled airspace. To fly a recreational drone any higher, you must seek approval from CASA and adhere to any associated conditions.

During flight, you must keep your drone at least 30 metres from anyone who is not directly associated with its operation. The drone must also not be flown over populated areas (that is, areas that are sufficiently crowded that the drone would pose an unreasonable risk to the life, safety or property of someone present). This includes crowded beaches or parks, or sports ovals where a game is in progress.

Better check the rules before going for shots like this. Gustavo Frazao/shutterstock.com

There is a general prohibition on flying a drone in a way that creates a hazard to another aircraft, person or property. A “hazard” may be interpreted fairly broadly. To be safe, CASA recommends keeping your drone at least 5.5km away from any airfield. Operations within 5.5km of an airfield are allowed in some instances, as long as they are not on the approach and departure path, and would not otherwise get in the way of aircraft using the airfield.

Recreational drone users are also advised to respect personal privacy by not recording or taking photos of people without their consent. While privacy concerns are not within CASA’s purview, operators may find themselves in breach of state and territory privacy or trespass laws, depending on how and where the drone is flown, and whether audio, video or photographic footage is recorded.

High flyers

As a general rule, drones cannot be flown for money or economic reward without a specific licence. There are, however, two new instances where such a certificate is not required: for commercial-like operations over your own land, and for commercial flights with very small drones (under 2kg) provided that the pilot notifies CASA at least five business days beforehand, and adheres to all the existing rules for recreational drone use.

Having considered all the rules, the Bunnings sausage sizzle incident starts to look less like a harmless jape and more like a multiple breach of the rules (although the video’s author has claimed that the video was an edited composite rather than all shot during a single flight).

The video appears to show several breaches of the rules, including: flying a drone out of visual line of sight (assuming that it is being piloted from the backyard hot tub depicted in the video); flying within 30m of people; and flying over a populated area. The operator is potentially facing a fine of up to A$9,000.

If you’re worried your new drone might get you into similar hot water, CASA provides significant guidance to help operators avoid infringing the rules. That way, you can make sure your high-flying gift doesn’t end up ruining your Christmas cheer.

Rebecca Johnston 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.

Experts say Theresa May, if she accepts view of report, would have to outline how government intends to protect the nation

In a landmark report, the government is to outline the specific risks it believes Britain faces due to the impact of climate change. The report, to be delivered early in the new year, will be the first response made by Theresa May’s administration to a major environmental concern and will have considerable implications for future green policy outcomes.

The UK climate change risk assessment, the first since 2012, will spell out what the government believes are the major risks facing Britain as global warming continues to affect the planet. Earlier this year, the Committee on Climate Change, a body of experts set up under the Climate Change Act to advise government, said Britain was poorly prepared for global warming. Likely impacts include deadly heatwaves, flooding, and food and water shortages, it said.

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Could wave energy ever power the world?

SENG QLD December Newsletter - Emergency Climate Action

Chalton, Hampshire In the morning we find a carpet of shining black pellets brimming with skulls and rubbery tails

At the highest and darkest point of the South Downs escarpment, an Anglo-Saxon hall stands beefy and lumbering under a black sky dusted with stars. Built with hand-hewn oak timbers and hazel spars, it is the latest addition to the educational farm on Butser Hill where I work as a creative developer, feeding goats and designing guide books.

The farm is an outdoor archaeological laboratory, and recreates ancient buildings from the neolithic period onwards. Inside the hall a log fire releases sparks like doves at a wedding, burning through the daylight hours to amuse wandering visitors searching for a taste of history.

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A UK designer launches the "30-year Christmas sweatshirt" to question the ethics of the "fast fashion" industry.

Temperatures at the North Pole could be up to 20 degrees higher than average this Christmas Eve.

British-born astronaut Piers Sellers has died of pancreatic cancer, aged 61, Nasa says.