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Comedian says she put out an announcement because of the need to protect oceans and the reef, and cannot understand what the fuss is all about

The US talkshow queen Ellen DeGeneres is bewildered her call to protect the Great Barrier Reef has sparked a backlash in Australia.

DeGeneres made headlines earlier in the week with the release of a video public service announcement as part of the Remember the Reef campaign.

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Astronaut Tim Peake is recognised in the Queen's Birthday Honours list.

From satellites giving information about soil quality to robotic fruit monitoring and water quality sensors for oysters - agricultural technology is being taken up at a rapid rate among Australia's farmers.

More than 80% of the world's population lives under light-polluted skies, a study suggests.

A team of scientists at the National Centers for Environmental Information in Boulder, Colorado have produced a digital atlas of the Earth that shows the levels of light pollution. The atlas makes use of low-light imaging now available from the NOAA/NASA Suomi National Polar-orbiting Partnership satellite, calibrated by thousands of ground observations. Light pollution is so severe in some parts of the world that a third of human beings cannot see the Milky Way

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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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A poll of environmental professionals showed most think the UK benefits from EU air pollution rules

The UK’s air pollution crisis would get worse if the country votes to leave the European Union, according to a new poll of environment professionals.

The UK already has levels of air pollution above legal EU limits in many cities, resulting in 40,000 early deaths a year, while ministers are currently lobbying in Brussels against lower air pollution limits.

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Tibetan antelopes, tussling Indian rat snakes and Europe’s last primeval forest are among this week’s pick of images from the natural world

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Manmade global warming greatly increased the risk of extreme rain affecting the French capital, analysis shows

The Paris floods, that saw extreme rainfall swell the river Seine to its highest level in decades, were made almost twice as likely because of the manmade emissions driving global warming, scientists have found.

A three-day period of heavy rain at the end of May saw tens of thousands of people evacuated across France, and the capital’s normally busy river closed to traffic because the water levels were so high under bridges. As artworks in the Louvre were moved to safety and Paris’s cobbled walkways were submerged, the French president, François Hollande, blamed the floods on climate change.

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Decision to allow shale gas tests in village of Kirby Misperton could be challenged in court, Friends of the Earth says

Anti-fracking campaigners have claimed that a decision to allow energy companies to drill for shale gas in Yorkshire could be challenged in court.

The fracking firm Third Energy was given permission last month to carry out test drilling at a site in Kirby Misperton in Rydale, North Yorkshire, even after locals opposed the application.

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The world is covered in more than 40m miles of road networks. What if this network could act like solar panels, and what if we could power our vehicles with the energy generated by this? In 2009, these questions formed the beginning of a vision for the future for Sten De Wit at the Netherlands Organisation for Applied Scientific Research in Delft, whose ideas are being put into practice with SolaRoad

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Coral bleaching is becoming an increasingly frequent and severe problem in a hotter world

Readers may have noticed that it’s been about a month since my last article. In recent weeks I presented guest articles in place of my own pieces. The reason for my absence was due to the adoption I was finalizing in the USA (my second successful adoption!). Anyone who has adopted a child can attest to the time and travel requirements. I intend that this article marks my return to near weekly posting and I thank my readers for their patience.

Coral reefs are important for the health of the ocean biosystem; they support and harbor a high density of diverse organisms. While there are reefs located in many locations around the world, people often think first about the Great Barrier Reef off the Australian coast. It is known for its size and beauty; it brings travelers close to nature.

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Archaeologists using satellite imagery discover a huge, ceremonial monument at the Petra World Heritage site in southern Jordan.

A hummingbird-like moth may have colonised the UK, according to conservationists.

Salisbury Plain, Wiltshire The breeding season has started late and male great bustards are still performing their elaborate courtship displays

We follow a pitted farm track over the brow of the hill and into the valley, then climb off-road to the hide. The 38,0000 hectare chalk plateau is a haven for wildlife with its patchwork of close-cropped grass, golden oilseed rape and small strips of soil ploughed bare to create stone curlew nesting plots.

In 1998 the Great Bustard Group began exploring the possibility of reintroducing this vulnerable species, which became extinct in the UK in 1832. Annual releases of imported bustards began in 2004 and the first eggs were laid by reintroduced birds in 2007, but the population is not yet self-sustaining. Although breeding has taken place every year, survival rates are low and not all surviving juveniles are recruited to the adult population. Lekking usually peaks in April, but this year the breeding season started later than usual and I’ve been told that there is still a chance of seeing the males perform their elaborate display.

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The project, which would create a guaranteed market for renewable energy, aims to reduce city’s annual emissions by 138,000 tonnes a year

It’s an unmistakably Melbourne setting: councillor Arron Wood is the city’s environment portfolio chairman, standing in a rooftop courtyard as the faint sound of trams rises up from Swanston Street down below and the surrounding skyline reaches into a cool autumn sky.

Against this backdrop, not to mention the solar thermal panels on the next level, Wood does not hold back when discussing how cities can lead from the front in tackling climate change.

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Sparrows are one of the five most common birds in Australian cities. Sparrow image from www.shutterstock.com

In Australia, like so many other countries, the house sparrow is one of the five most commonly seen birds in backyards and gardens. This is a result of intentional introductions over the past two centuries.

The story of how house sparrows came to Australia has several new twists. Recent research shows just how much effort was made to introduce the species as an early form of bio-control (almost a century before the cane toad was introduced to help control the cane beetle).

Most surprisingly, historical documents reveal that the first house sparrows to arrive and breed in Australia actually arrived from India, not England as has been believed for more than 100 years.

Alongside them came the most vilified introduced bird in Australia, the common myna.

Introduced birds

Over the past two centuries Australia has become a new home for hundreds of introduced species of plants and animals. Many of these have become serious pests, causing major losses to agricultural production and threatening Australia’s endemic biodiversity.

The house sparrow and myna dominate many urban areas in Australia but, on account of their dependence on people, have mostly stayed in human-modified environments. They have apparently caused little damage to native species.

While species have been introduced to Australia for a variety of reasons, many people assume that these birds were introduced for very frivolous ones.

Common belief is that English songbirds were introduced by homesick colonists so they could once again hear the familiar sounds of home, in a land where the birds were unfamiliar. But our research reveals a different story.

If you have mynas nearby, you’ll know about it. Myna image from www.shutterstock.com The sparrow campaign

The first sparrows arrived in Australia in late 1862. They were shipped after a prolonged campaign led by Edward Wilson, editor of the Melbourne Argus.

Wilson had established the Victorian Acclimatisation Society, set up with the support of the Victorian government to import useful species. Sparrows, it was thought, could help the struggling agricultural sector.

A series of articles and editorials in 1860-61 drew attention to famines in Hungary and France that were reportedly caused by the destruction of so many songbirds in the farming districts of those countries.

Studies in Switzerland showed that while sparrows do cause some damage to fruit crops, this is outweighed by the number of insect pests that the birds feed to their nestlings (3,000 per nest).

In 1860 Wilson called for farmers to “wage war” on insects pests with sparrows and starlings. He also confessed that:

I like to see a bird in the streets, and I have a kindly feeling for the sparrow for his friendly confidence in this way.

This attitude may explain accusations of frivolity, but the sparrow was valued above other birds because they associated more strongly with people than other birds, and their worth had been demonstrated in Europe and New York where they had been introduced to attack insects defoliating city trees.

By today’s standards, however, efforts to ascertain the ecological and agricultural risks were very poor. The same people are also to blame for the introduction of the rabbit, fox and carp – to mention just three major pests.

Indian arrivals

So, in the early 1860s, Wilson and the Acclimatisation Society went to great efforts to transport birds from Europe. Birds were kept alive during the long voyage by sea and then acclimated to Australian conditions by being held in large aviaries in Melbourne (on the site that later became the Melbourne Zoo), before their release around the colony. This was a challenging enterprise and the value of a live sparrow arriving in Melbourne encouraged greater care on board the ships.

An inadvertent consequence of the economic value placed on the arrival of a sparrow in Australia was that it created a new market for opportunism. The sea passage from India was significantly shorter than that from Europe and an enterprising shipping agent in India, G. J. Landells, took full advantage of this.

New research has uncovered clear documentary evidence that house sparrows arrived from India in 1862 and were breeding successfully in Melbourne before any arrived alive from England (in early 1863). This means it is highly likely that the house sparrows in Australia today are a genetic mix of Indian and European sparrows. The house sparrows in India were native to the subcontinent and are a different race of house sparrow from the one in Europe.

The newspapers of the time also make it clear that, along with each shipment of sparrows from India, a number of common mynas also arrived. This is presumably because they were abundant in the same places as the sparrows and it was argued that they would be a useful addition for eating insects in towns and farms.

In 1863, Landells placed an advertisement in The Sydney Morning Herald offering to export more “minas” to Melbourne for 20 shillings each, and house sparrows at ten shillings each.

While it’s unlikely that he became rich on the back of such a market, his enterprise changed the avian landscape of Australia’s backyards forever.

Simon Griffith receives funding from the Australian Research Council.

BBC Click smashes one of the panels on the world's highest and longest glass-bottomed bridge to see how safe it is.

Exclusive: Proposed mines to produce aluminium are putting the habitat of vulnerable Cape York palm cockatoo at risk, sparking calls for stronger environmental laws

Australia’s spectacular palm cockatoo is being put at risk by proposed bauxite mines, conservationists have said.

The Cape York palm cockatoo, Australia’s largest cockatoo, is listed as vulnerable under Australia’s federal environment laws. About 3,000 mature birds are thought to exist, and their numbers are declining.

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To halt climate change and prevent dangerous warming, we ultimately have to stop pumping greenhouse gases into the atmosphere. While the world is making slow progress on reducing emissions, there are more radical options, such as removing greenhouse gases from the atmosphere and storing them underground.

In a paper published today in Science my colleagues and I report on a successful trial converting carbon dioxide (CO₂) to rock and storing it underground in Iceland. Although we trialled only a small amount of CO₂, this method has enormous potential.

Here’s how it works.

Turning CO₂ to rock

Our paper is the culmination of a decade of scientific field and laboratory work known as CarbFix in Iceland, working with a group of international scientists, among them Wallace Broecker who coined the expression “global warming” in the 1970s. We also worked with the Icelandic geothermal energy company Reykjavik Energy.

The idea itself to convert CO₂ into carbonate minerals, the basis of limestone, is not new. In fact, Earth itself has been using this conversion technique for aeons to control atmospheric CO₂ levels.

However, scientific opinion had it up to now that converting CO₂ from a gas to a solid (known as mineralisation) would take thousands (or tens of thousands) of years, and would be too slow to be used on an industrial scale.

To settle this question, we prepared a field trial using Reykjavik Energy’s injection and monitoring wells. In 2012, after many years of preparation, we injected 248 tonnes of CO₂ in two separate phases into basalt rocks around 550m underground.

Most CO₂ sequestration projects inject and store “supercritical CO₂”, which is CO₂ gas that has been compressed under pressure to considerably decrease its volume*. However, supercritical CO₂ is buoyant, like a gas, and this approach has thus proved controversial due to the possibility of leaks from the storage reservoir upwards into groundwater and eventually back to the atmosphere.

In fact, some European countries such as the Netherlands have stopped their efforts to store supercritical CO₂ on land because of lack of public acceptance, driven by the fear of possible leaks in the unforeseeable future. Austria went even so far as to ban underground storage of carbon dioxide outright.

Our Icelandic trial worked in a different way. We first dissolved CO₂ in water to create sparkling water. This carbonated water has two advantages over supercritical CO₂ gas.

First, it is acidic, and attacks basalt which is prone to dissolve under acidic conditions.

Second, the CO₂ cannot escape because it is dissolved and will not rise to the surface. As long as it remains under pressure it will not rise to the surface (you can see the same effect when you crack open a soda can; only then is the dissolved CO₂ released back into the air).

Dissolving basalt means elements such as calcium, magnesium, and iron are released into pore water. Basaltic rocks are rich in these metals that team up with the dissolved CO₂ and form solid carbonate minerals.

Through observations and tracer studies at the monitoring well, we found that over 95% of the injected CO₂ (around 235 tonnes) was converted to carbonate minerals in less than two years. While the initial amount of injected CO₂ was small, the Icelandic field trial clearly shows that mineralisation of CO₂ is feasible and more importantly, fast.

Storing CO₂ under the oceans

The good news is this technology need not be exclusive to Iceland. Mineralisation of CO₂ requires basaltic or peridotitic rocks because these types of rocks are rich in the metals required to form carbonates and bind the CO₂.

As it turns out the entire vast ocean floor is made up of kilometre-thick oceanic basaltic crust, as are large areas on the continental margins. There are also vast land areas covered with basalt (so-called igneous provinces) or peridotite (so-called “ophiolitic complexes”).

The overall potential storage capacity for CO₂ is much larger than the global CO₂ emissions of many centuries. The mineralisation process removes the crucial problem of buoyancy and the need for permanent monitoring of the injected CO₂ to stop and remedy potential leakage to the surface, an issue that supercritical CO₂ injection sites will face for centuries or even millennia to come.

On the downside, CO₂ mineralisation with carbonated water requires substantial amounts of water, meaning that this mineralisation technique can only succeed where vast supplies of water are available.

However, there is no shortage of seawater on the ocean floor or continental margins. Rather, the costs involved present a major hurdle to this kind of permanent storage option, for the time being at least.

In the case of our trial, a tonne of mineralised CO₂ via carbonated water cost about US$17, roughly twice that of using supercritical CO₂ for storage.

It means that as long as there are no financial incentives such as a carbon tax or higher price on carbon emissions, there is no real driving force for carbon storage, irrespective of the technique we use.

*Correction: The sentence has been corrected to note that gas volume rather than density decreases when it is compressed. Thankyou to the readers who pointed out the error.

Dom Wolff-Boenisch 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.