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Nearly every house in this rural 450-acre development of stargazers is equipped with its own domed observatory, and outdoor lights are strictly forbidden. Does it also hold answers for combatting America’s problem with light pollution?

Take a nighttime drive into Arizona Sky Village, in a remote valley in south-east Arizona, and the only thing you can see clearly are the millions of stars twinkling overhead. Beyond the light show, the sky is a deep inky black, and the ground below is nothing but shadows. Dimmed car headlights might pick up spooked jackrabbits hopping through the desert brush, but the village’s unlit houses are all but invisible in the darkness.

That’s the way the residents of this astronomy-loving community like it. The less light, the better their view of the universe.

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Despite talking up the future of the coal sector for years, Rio has been divesting itself of the commodity.

A Coffs Harbour marine park is facing a legal challenge over their claims that the dolphins in their park are "happy and healthy".

New tool maps the potential increase in bike journeys under different scenarios – from routes avoiding hills to adopting e-bikes – revealing health benefits and informing future investment

Chances are you live in a place where less than one in 20 commuters regularly cycle to work. Sometimes people assume this is because England is too hilly, or that most home-to-work distances are too far to cycle. Hilliness and distance do matter. However, new research has found that this is only part of the story. With the right cycling conditions, cycling levels could be much higher than they are now.

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First WI report on food waste finds confusion persists over ‘best before’ and ‘sell by’ dates, with supermarkets potentially contributing to the problem

The Women’s Institute is urging supermarkets to do more to help consumers reduce their domestic food waste, after a survey of its own membership revealed widespread confusion about “best before” and “use by” labelling on packaging.

Its new analysis of products on supermarket shelves found that “once-opened” instructions were often contradictory and often failed to make clear whether they were a guide to food safety or quality.

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For 40 years I hunted elephants and other big game in the forests of Rwanda. This is how I became an ex-poacher

I was born in Kinigi, in Rwanda’s Musanze district, about 65 years ago, and it is still my home. I come from the Batwa community; we are very short people. There are about 400 of us, which makes us the smallest tribe in Rwanda.

We lived in the forests long before the government took them over, and we were known as their keepers. They meant everything to us. I did not even know what a school was. Like my parents, my brother and my two sisters, all I knew was life in the forest.

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The fifth Emissions Reduction Fund auction was held on April 5–6. As forecast in our earlier auction outlook, results are a considerable step down from earlier auction events.

Sandy, Bedfordshire Climate change has boosted the songbirds’ advance northwards, and they seem to fill every copse

In the rising chorus over the past few weeks, one migratory bird has stood out as insistent, persistent, and more variable in its simple song than most books would have us believe.

Chiffchaffs are on the up; climate change has warmed their advance northwards, and here in the south they seem to be filling every copse, every patch of scrubland. They are often heard, but far less frequently seen.

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VSUN looks to household market for vanadium redox flow batteries, and to a local manufacturing facility to help reduce prices.

South Australia says it has received 31 proposals from 12 countries for its proposed emergency back-up gas generator.

The most important impact of the crisis facing Toshiba and Westinghouse is the chilling effect it will have ‒ and is already having ‒ on the nuclear power industry.

Despite the bravado of the fossil fuel apologists, the tide to clean energy is turning. Seven events in the past two months highlight the significant and unstoppable transformation that is occurring in our energy system.

The winning tariff is for 250 MW of solar capacity in the Indian state of Andhra Pradesh.

China’s wind and solar industry is projected to expand fivefold by 2030. So what’s fuelling this historic shift?

Climate change continues its rapid reshaping of the Arctic as yet another month saw sea ice set a record-low mark.

Is building a coal plant in 2017 more trouble than it’s worth?

The Australian government plans to target invasive European carp with a herpes virus, leaving hundreds of thousands of tonnes of carp rotting in the river systems that supply our drinking water and irrigate the fruit and vegetables we eat.

The aim of “Carpageddon” is to return Australian aquatic ecosystems to their pre-carp state by eliminating or reducing the serious pest species.

Carp currently make up 83% of the fish biomass in the Murray-Darling Basin in New South Wales. They alter river and lake habitats in a way that reduces habitability for native species, including five threatened species. They also have a major impact on inland fisheries, with an estimated annual economic cost of A$22 million.

This all makes a substantial argument for releasing a carp killing herpes virus. However, dealing with the aftermath could cost A$30 million for NSW alone.

Cleanup costs could be reduced by introducing viruses to discrete populations. However, if the virus escapes into the Murray-Darling Catchment, we will lose control of the virus spread and carp death will be rapid and widespread.

Without a dedicated cleanup effort, the sudden influx of millions of dead fish could permanently pollute our waterways. A potential solution is to recruit nature’s cleaners to do our work for us – scavengers like turtles and crayfish. They could save us from carcass-choked rivers and wetlands, but only if we can protect them from endangerment and extinction.

Turtles and crayfish are our unlikely saviours

Carp carcasses are normally eaten by scavengers, a process that’s vital to the food web (the system of what eats what in a given environment). In fact, the majority of dead fish are consumed by scavengers.

As such, simply removing the carp carcasses may reduce the overall amount of nutrients in the ecosystem. This would destabilise the food web, especially for scavengers such as turtles and crayfish who rely on them.

Instead, these scavenging species can provide crucial biocontrol. They would eat any decomposing flesh in our water systems, particularly in areas we can’t easily access with nets, boats and trucks. They would maintain the quality of our waterways in three ways:

• Slow the spread of bacteria that break down dead fish, keeping water safe to drink and limiting deoxygenation that could devastate native fish species;

• Digest carp directly into basic nutrients (fertiliser) that is more readily absorbed by plants and primary producers;

• Semi-permanently store carp nutrients in their slow to decompose shells and exoskeletons, preventing or limiting toxic algal blooms caused by excess nutrients in water.

Our unlikely saviours are also dying

Threats to crayfish include agricultural and urban expansion, recreational fishing, pollution from surface runoff and insecticides, and introduced species such as trout and cane toads.

Consequently, native crayfish are declining, with nearly 80% of Spiny Crayfish recognised as threatened. However, yabbies have expanded their range.

Turtles on the other hand, are in sharp decline throughout the Murray Catchment and elsewhere in Australia. A recent gathering of turtle experts in Canberra discussed major threats to turtles, and ways to protect them.

The meeting addressed major causes behind the 2% annual mortality rate of adult turtles that is leading the species to rapid extinction. Cars and foxes kill a significant number of adult turtles every year, and foxes destroy more than 95% of turtle nests in the Murray-Darling Basin.

Changes to the hydrology of the Murray Catchment may also impact turtles. Some species require permanent wetlands, while others prefer to move between temporarily flooded wetlands and more permanent waters.

Following modern water management, some temporary wetlands are permanently flooded or gone and some permanent wetlands are dry.

All of these threats together may cause turtles to become functionally extinct in the near future, meaning they cannot play their significant role in the ecosystem anymore.

How can we help conserve the turtle population?

Such a sudden decimation of carp has potentially catastrophic consequences. But it may also be an excellent opportunity to recognise the importance of turtles and prioritise their conservation.

In a recent study, headstarting was named as the only management tool that could protect freshwater turtles from the multiple threats throughout their life cycle and eliminate all risks of extinction.

Headstarting involves rearing eggs or newborn animals in captivity, then releasing them into the wild. It has been controversial for decades, but releasing thousands of little turtles throughout the Murray River just might rescue us from the post-apocalyptic effects of Carpageddon.

Ricky Spencer receives funding from Australian Research Council, North-Central Catchment Management Authority, Yorta Yorta Aboriginal Corporation, Foundation for National Parks and Wildlife, Victorian Department of Land, Environment, Water and Planning, Winton Wetlands, Turtles Australia, Inc. and Save Lake Bonney Group Inc.

Claudia Santori receives funding from the University of Sydney.

James Van Dyke receives funding from Australian Research Council, North-Central Catchment Management Authority, Yorta Yorta Aboriginal Corporation, Foundation for National Parks and Wildlife, Victorian Department of Land, Environment, Water and Planning, Winton Wetlands, Turtles Australia, Inc. and Save Lake Bonney Group Inc.

Michael B. Thompson receives funding from the ARC and the University of Sydney.

Coal mines, such as this one near Bowen, use water for everything from equipment cooling to dust management. CSIRO, CC BY

From accidental water spills into coastal wetlands, to proposed taxpayer-funded loans, Adani’s planned Carmichael coal mine and the associated Abbot Point coal terminal can’t keep out of the news at the moment.

Last week, the granting of an unlimited 60-year water licence to the Carmichael mine, in Queensland’s Galilee Basin, rattled environmentalists, farmers and community groups alike.

In a region experiencing prolonged drought conditions, the provision of unlimited water for one of the largest mining operations in the Southern Hemisphere seems like a commitment at odds with current climate predictions. The decision has also prompted a raft of wider questions about the industry’s water use.

Why do coal mines need so much water?

Underground coal mines rely on water to reduce the hazard of fires or explosion, by using it to cool the cutting surfaces of mining equipment and prevent coal dust from catching fire.

Water also helps to manage dust produced during the processing stage, when coal is crushed and ground. Coal is then transported through pipelines as a water-based slurry for further processing.

Mines also need water for things like equipment maintenance, and for consumption by the mining communities themselves.

In total, about 250 litres of freshwater are required per tonne of coal produced. This freshwater makes up around a quarter of the total water demand during coal production, the rest being “worked” (recycled) water.

What other industries use lots of water?

The Great Artesian Basin is one of the largest underground water reservoirs in the world. It underlies 22% of Australia’s land area, beneath the arid and semi-arid parts of Queensland, New South Wales, South Australia and the Northern Territory.

Its aquifers supply water to around 200 towns or settlements, most of which are allowed to draw between 100 and 500 million litres (ML) per year.

The Great Artesian Basin covers almost a quarter of Australia. Tentotwo/Wikimedia Commons, CC BY-SA

The Great Artesian Basin underpins A$12.8 billion of economic activity annually, according to a 2016 report commissioned by the federal government. Almost all of this is from mining and coal seam gas (A$8 billion) and livestock farming (A$4.7 billion).

In Queensland, mining and industry hold just over 1% (by number) of the water licences linked to the Great Artesian Basin but account for 10% of the water extracted. Coal seam gas accounts for a further 22% of water, with no licensing required. In contrast, livestock production accounts for 88% of water licences but just 46% of the extracted water.

The Carmichael mine’s 12,000ML forecasted use (equivalent to 4% of the water extracted from the Great Artesian Basin in Queensland last year) would put it alongside the biggest annual users of Great Artesian Basin water, such as the Olympic Dam copper and uranium mine in South Australia, which currently draws 10,000ML each year.

Why does Adani need unlimited water anyway?

According to the company’s own modelling, the Carmichael mine’s annual freshwater use is projected to peak at just over 12,000ML – or roughly 13 Olympic swimming pools per day.

Despite these estimates, the water licence granted to Adani puts no limit on the water it can take from the Great Artesian Basin. However, it calls for regular monitoring of water levels, quality and flow in each aquifer that is tapped.

Unlike other controversial Queensland mining projects, such as the New Acland coal mine, Adani’s water licence application was exempted from public scrutiny, courtesy of a November 2016 amendment to the existing laws.

Water licences usually specify the total amount, and/or the daily rate, of groundwater that can be taken. Changes to a water licence to increase the amount of water must be assessed like a new application and pass public scrutiny. But with an unlimited licence, there is no need for Adani to apply for a new licence if they need more water than originally predicted.

What are the environmental effects of industrial-scale water usage on the basin?

Despite a net yearly decrease of 286,000ML in the water stored within the Great Artesian Basin, it is in no danger of running dry. The past 120 years of exploitation have used up less than 0.1% of the water stored.

The real issue is water pressure. Flows from artesian bores are now roughly half what they were in 1915. Since then, the water level in some bores has fallen by as much as 80 metres, and a third of bores have stopped flowing altogether. This directly affects the human, plant and animal communities that rely on artesian water.

Because of their isolation, the natural springs of the Great Artesian Basin are home to many unique plant and animal species. Desert springs are particularly vulnerable to declining water pressure, and many spring habitats have been irreversibly damaged by invasive species, excavation, livestock, industrial activity and even tourists.

An oasis in South Australia’s arid interior. Tandrew/Wikimedia Commons, CC BY-SA

Can mining industries be more water-wise?

Recycled water is an integral part of coal mining, but it contains salt, added in the dust-management stage, which can leave the water unusable for certain processes. Nevertheless, a recent study suggests that Queensland coal mines could cut their freshwater use by 62% simply by using recycled water for processes that are not sensitive to salt levels. Diluting salty recycled water could also reduce freshwater use by 50%, and cut water costs by 40%.

Untreated seawater is perhaps the most sustainable water of all, although transporting it from coast to mine costs energy and therefore money. Its saltiness also creates chemical challenges during coal and uranium processing.

Another option to address climate-induced water challenges might be for mines to share water allocations.

Where do we go from here?

Understandably, there is significant concern that Adani’s unlimited licence will allow the mine to draw more water than predicted. Should the mine go ahead, it is important that the research community continues to scrutinise the regular water quality and usage reports that Adani is required to provide. Water licences can, after all, be revoked.

We should also be concerned about industries like coal seam gas that currently do not require water licensing, but nevertheless use huge amounts of artesian water.

Although water is an important issue, it is vital not to lose sight of the numerous other environmental impacts of the Carmichael mine. For example, an estimated 4.7 billion tonnes of greenhouse gas emissions will result from the mining and burning of Carmichael coal. Climate warming will impact Australia on multiple fronts, including bleaching of the Great Barrier Reef, increasing the intensity of tropical cyclones, causing more heat-related deaths, diseases and droughts.

Ellen Moon works on a project funded by the Cooperative Research Centre for Contamination Assessment and Remediation of the Environment.

Committee calls for deposit return scheme and free refill stations after finding capital hooked on bottled water but not recycling

The amount of waste from single-use plastic bottles in London has risen out of control, according to a report from the London assembly environment committee.

It calls on the mayor to consider introducing a deposit return scheme and to provide free tap water as an alternative.

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The home of BHP and Mad Max can now take credit for kickstarting the large-scale solar industry in Australia

Broken Hill is the birthplace of modern mining in Australia. It lends its initials “BH” to the mining giant BHP, and in January 2015 in an Australian first, the so-called Silver City was added to the National Heritage list in part due to its mining industry.

The city is cut in half by a mine, with a giant pile of waste material rising from its centre. It can be seen from every street in town, like a monument to the stuff the city was built from.

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