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US President Barack Obama expands a national monument off Hawaii, creating the world's largest marine reserve.

We're keeping tabs on barramundi; the Yandina farmers market explodes in a riot of colour; we meet a young woman with a passion for her hairy belted galloways; and we do the rounds during lambing time

The week’s top environment news stories and green events. If you are not already receiving this roundup, sign up here to get the briefing delivered to your inbox

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Soldier crabs, a family of brown bears and spotted hyenas are among this week’s pick of images from the natural world

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A collection of posters created to promote tourism to the national parks is part of the creative legacy of the New Deal developed by Franklin D Roosevelt. Between 1938 and 1941, the Works Progress Administration and its Federal Arts Project designed a series of artworks promoting, and inspired by, the landscapes and wildlife of the parks. The collection is housed in the Library of Congress

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A California biotech company receives funding to commercialise algae-based prawns, in an attempt to get people switching to more sustainable diets

How do you describe the taste and texture of a prawn? Sort of rubbery; elastic, even. Like chicken, only better. These unappetising phrases hardly capture what makes it so good—the precise reason why prawns (called shrimp in the United States) are one of the most consumed seafoods globally. But now biotech startup New Wave Foods is on a mission to mimic the exact texture and taste of a prawn, in a product made entirely out of algae and plant ingredients.

The small, orangey-pink whorls they’ve created look uncannily like the real thing. But what do they taste like? That’s a question for Dominique Barnes, CEO of California-based New Wave Foods. “We’ve done a few blind taste tests—unofficially, you know—and until we tell people it’s made of plants and algae they can’t tell,” says Barnes, who comes from a background in marine conservation.

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Researchers track a particular type of tiny vibration for the first time, as it wobbled through the Earth from the Atlantic to Japan.

Government countryside assessment paints a ‘grim picture’ with key species such as hedgehogs, dormice, birds and butterflies all continuing to decrease in number

Much of England’s best-loved wildlife remains in serious decline, according to the latest official assessment from the government. Birds and butterflies on farmland have continued their long term downward trend and 75% of over 200 “priority” species across the country – including hedgehogs, dormice and moths – are falling in number.

The Natural Environment Indicators for England also showed that water quality has fallen in the last five years, with just one in five rivers and lakes having high or good status, and the amount of time given by conservation volunteers has also fallen.

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Authorities find more than 650 critically endangered pangolins hidden in freezers in Java

Indonesian authorities have seized more than 650 critically endangered pangolins found hidden in freezers and arrested a man for allegedly breaking wildlife protection laws, police said on Friday.

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Papahānaumokuākea Marine National Monument to be expanded to more than twice the size of Texas

Barack Obama is to create the world’s largest protected marine area off the coast of Hawaii, the White House has said.

The president’s proclamation will quadruple the size of a protected area originally designated by his predecessor, George Bush, in 2006. The expanded Papahānaumokuākea Marine National Monument will cover around 582,578 sq miles (1.5m sq km), more than twice the size of Texas.

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Shamim Shorif Susom is a pilot and photographer from Bangladesh. As he travels he captures unique aerial views of his country, which he shares on his website

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We really love having you listen to RN but we need to let you know that we’ll be closing our subject podcasts (don’t worry—we aren’t cancelling any shows). To keep hearing stories and interviews from RN, search for your favourite shows in the ABC Radio App or subscribe in your preferred podcasting app.

Airedale, West Yorkshire By early September mating instincts will give way to a territorial urge and this stretch of river won’t be big enough for both birds

They’re still together, but it won’t last. The sycamore keys have started to twirl to earth and a parting of ways is on the cards. Kingfisher pairs seldom outlast the summer; by early September mating instincts will have given way to the territorial urge, and that’ll mean that this stretch of the river won’t be big enough for the both of them.

It’s warm, a bit muggy, and the air is thick with the musty stink of rosebay willowherb. Mallard drakes in their dowdy moult or “eclipse” plumage lounge in sulky gangs on the gravel spit, exiled dukes stripped of their finery.

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Many of Australia's nearest neighbours in the Pacific Islands have far more ambitious renewable energy targets.

Our EcoCheck series takes the pulse of some of Australia’s most important ecosystems to find out if they’re in good health or on the wane.

Australia’s Top End, Kimberley and Cape York Peninsula evoke images of vast, awe-inspiring and ancient landscapes. Whether on the hunt for a prized barramundi, admiring some of the oldest rock art in the world, or pursuing a spectacular palm cockatoo along a pristine river, hundreds of thousands of people flock to this region each year. But how are our vast northern landscapes faring environmentally, and what challenges are on the horizon?

Above 17° south, bounded by a rough line from Cairns, Queensland, to Derby, Western Australia, are the high-rainfall (more than 1,000mm a year) tropical savannas. These are the largest and most intact ecosystem of their kind on Earth. With the exception of some “smaller” pockets of rainforest (such as Queensland’s Kutini-Payamu (Iron Range) National Park), the vegetation of the region is dominated by mixed Eucalyptus forest and woodland with a grassy understorey.

Within the fire-prone Great Northern Savannas exist fire-sensitive communities such as these Allosyncapria ternata rainforests along the edge of the Arnhem Plateau in Kakadu National Park. Brett Murphy

There is a distinct monsoonal pattern of rainfall. Almost all of it falls during the wet season (December-March), followed by an extended dry (April-November). Wet-season rains drive abundant grass growth, which subsequently dries and fuels regular bushfires – making these landscapes among the most fire-prone on Earth. The dominant land tenures of the region are Indigenous, cattle grazing and conservation.

Cattle grazing is widespread in the Great Northern Savannas. Mark Ziembicki

These savannas are home to a vast array of plant and animal species. The Kimberley supports at least 2,000 native plant species, while the Cape York Peninsula has some 3,000. More than 400 bird and 100 mammal species call the region home, along with invertebrates such as moths, butterflies, ants and termites, and spiders. Many of the latter are still undescribed and poorly studied.

Many species, such as the scaly-tailed possum, are endemic to the region, meaning they are found nowhere else.

A large male antilopine wallaroo, endemic to tropical Australia. Euan Ritchie

The general lack of extensive habitat loss and modification, as compared to the broad-scale land clearing in southern Australia since European arrival, can give a false impression that the tropical savannas and their species are in good health. But research suggests otherwise, and considerable threats exist.

Fire-promoting weeds such as gamba grass, widely sown until very recently as fodder for cattle, are transforming habitats from diverse woodlands to burnt-out, low-diversity grasslands. Indeed, the fires themselves, which are considered too frequent and too late in the dry season at some locations, are now thought to be a primary driver of species loss.

Notable examples of wildlife in trouble include declines of many seed-eating birds, such as the spectacular Gouldian finch, and the catastrophic decline of native mammal species, most prominently in Australia’s largest national park, Kakadu.

Bauxite mining threatens the habitat of vulnerable Cape York palm cockatoos. Mark Ziembicki

Added pressures include bauxite mining, forestry and cattle grazing. The latter activity exerts strong pressures on the characteristically leached, nutrient-poor, tropical soils. Most recently, changes to Queensland’s land-clearing laws have led to virgin savanna woodland being cleared.

It is likely some threats may also combine to make matters worse for certain species. For instance, frequent fires, intensive cattle grazing and the overabundance of introduced species such as feral donkeys and horses all combine to remove vegetation cover. This, together with the presence of feral cats, makes some native animals more vulnerable to predation.

New threats

This globally significant ecosystem, already under threat, is facing new challenges too. Proposals to use the region as a food bowl for Asia are associated with calls for the damming of waterways and land clearing for agriculture.

This is against a backdrop of climate change, which among other effects may bring less predictable wet seasons, more frequent and intense storms (cyclones) and fires, and hotter, longer dry seasons. Such changes are not only likely to harm some species, but could also make those much-touted agricultural goals far more difficult to achieve.

Great opportunities exist in northern Australia, but we need to avoid the mistakes of the past. Mark Ziembicki

Great opportunities do exist in northern Australia, including carbon farming and expanded tourism enterprises. In some cases this might require difficult transitions, as already seen in parts of Cape York Peninsula, where often economically unviable cattle stations have become joint Indigenous and conservation-managed lands.

A key priority for the Great Northern Savannas should be to maintain people on country. It’s often thought that the solution to reducing environmental impacts is removing people from landscapes, but as people disappear so too does their stewardship and ability to manage and care for the land.

Importantly, and finally, we must also learn the historical lessons from southern Australia if we are to avoid making similar mistakes all over again, jeopardising the unique and precious values of the north.

Are you a researcher who studies an iconic Australian ecosystem and would like to give it an EcoCheck? Get in touch.

Euan Ritchie receives funding from Pozible, the Australia and Pacific Science Foundation, and the Australian Research Council. Euan Ritchie is affiliated with the Ecological Society of Australia and the Australian Mammal Society.

Brett Murphy receives funding from the Australian Research Council, the National Environmental Science Programme and the Hermon Slade Foundation.

Australian company proposes 100MW solar farm with single axis tracking technology, going into "merchant market" with no additional grants.

The fourth ERF auction has recently been announced. This matters immensely for the waste and local government sectors.

The state’s new climate goals are far more ambitious than those of the US overall, and they’re in line with ambitions in Europe.

JinkoSolar today announced its unaudited financial results for the second quarter ended June 30, 2016.

The Governor of New York State says Americans will be reading by candlelight unless nuclear is subsidised. But how about a look at the data.