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The fourth largest ice shelf in Antarctica, known as Larson C, has developed a crack 180km long. It is only a matter of time before a giant iceberg peels away and floats free in the Antarctic circumpolar current.

Sure, seabirds might've been flying past, but how did tiny forest birds make it all the way to Lord Howe Island in the middle of the sea?

Writer Inga Simpson recounts experiences of a tree change to the Sunshine Coast hinterland.

The transformation of Singapore into a garden city.

The transformation of Singapore into a garden city.

A tree planting project transforms a Bega Valley landscape; a young couple grinds out a living off just eight hectares; we turn unwanted fruit and veg into edible powder; and meet four-year-old dog trialler Alyssa Brown.

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 stalking tiger, playful long-eared owl chicks and a rare dormouse are among this week’s pick of images from the natural world

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World Land Speed record holder Andy Green examines how the extremes of speed and acceleration will affect the airflow around the Bloodhound supersonic car.

A directeur sportif must juggle route navigation, team communication, tactics and technical backup – all while driving at high speed. Amy Sedghi hitches a ride on the women’s Tour de Yorkshire to see how it’s done

“I need a bike change”. The urgent call comes after about 45km.

Another rider has hit Audrey Cordon-Ragot’s rear wheel in women’s Tour de Yorkshire and the radio crackles with her call for a replacement to be brought forwards. The Wiggle High5 team’s directeur sportif, Donna Rae Szalinski, has her foot on the accelerator and a hand on the horn, beeping a warning at the other support cars as she zips up the right hand side at 70kmh to deliver a new bike.

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The highly anticipated Finkel review on the future of the national electricity market was released on Friday. Its weak emissions target breaks Australia’s Paris commitments, but the review may well end the deadlock on carbon emissions that has plagued politics for over a decade

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Animals take umbrage when they feel that others are getting greater rewards than they are.

Chief Scientist Dr Alan Finkel's report into the national energy market is finally out in the open, and calls for immediate action.

Voluntary initiative marks first time companies from Asia, Europe and US have joined together to stop overfishing, illegal catch and use of slave labour

Nine of the world’s biggest fishing companies have signed up to protect the world’s oceans, pledging to help stamp out illegal activities, including the use of slave labour, and prevent overfishing.

The initiative will be announced on Friday, as part of the UN Ocean Conference this week in New York, the first conference of its kind at which member states are discussing how to meet the sustainable development goal on ocean health.

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Helpers endure the rain and swell to look after a whale that became stuck on a beach in New South Wales, Australia. The group used guide ropes to keep the animal upright as the tide fell, enabling it to breathe. The animal, which is nine metres long and weighs about 18 tonnes, will remain beached at least until the high tide arrives in the evening, experts said.

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The Finkel Review is scientifically modest but politically deft. Lukas Coch/AAP

The keenly anticipated Finkel Review, commissioned in the wake of last year’s South Australian blackout, has made a range of recommendations aimed at delivering a reliable, secure and sustainable National Electricity Market.

Among the proposals is a new Clean Energy Target to boost investment in low-carbon electricity generation, as well as moves to require high-emitting power stations to give three years’ notice before shutting down.

Below, our experts react to the measures.

“Security and reliability are first”

Hugh Saddler, Honorary Associate Professor, Australian National University

With so much focus on the design of a mechanism to support a shift towards lower-emissions generation, it is easy to forget that the primary purpose of the Review, commissioned following the “system black” event in South Australia on September 28, 2016, was “to develop a national reform blueprint to maintain energy security and reliability”. It is thus appropriate that security and reliability are the first topics to be addressed in the main body of the report.

System security is defined as the ability of the system to tolerate disturbances. Maintaining security requires the system to be able to prevent very high rates of change of frequency. At present the system has no explicit mechanism for doing this, but relies implicitly on the inertia provided, effectively as a free service, by existing large thermal generators.

The report recommends a series of regulatory energy security obligations to provide this service by various additional means, falling on the transmission network service providers in each of the five NEM regions (states), and also on all new generators connecting to the system.

System reliability is defined as the ability of the system to meet consumer demand at all times. In the old system, this is achieved by “dispatchable” generators, meaning coal and gas generators that can vary their output as required to meet demand.

In the new system, with large amounts of variable wind and solar generation, other supply sources are needed to meet demand at times of low wind speed and/or lack of sun – that is, to act as complements to wind and solar. Existing hydro and open-cycle gas turbine generators are ideally suited to this task, but with the growth in wind and solar generation, this capacity will very soon be insufficient for the task across the NEM (and is already insufficient in SA).

The Report recommends what it calls a Generator Reliability Obligation, which would be triggered whenever the proportion of dispatchable generation (which could include batteries and other forms of storage) in a region is falling towards a predetermined minimum acceptable level. The obligation would fall on all new renewable generators wishing to connect thereafter and, in the words of the Report “would not need to be located on site, and could utilise economies of scale” through multiple renewable generation projects “pairing” with “one new large-scale battery of gas fired generation project for example”.

If implemented, this recommendation would seem certain to greatly complicate, slow down and add to the administrative overhead cost of building new renewable generation. It would involve putting together a consortium of multiple parties with potentially differing objectives and who would otherwise be competing with one another in the wholesale electricity market.

A far better approach would be to recognise that dispatchable generation provides a distinct and more valuable product than non-dispatchable generation. There should be a separate market mechanism, possibly based on a contracting approach, to provide this service. If well designed, this would automatically ensure that economies of scale, as may be realised by pumped hydro storage, for example, would be captured. This approach would be far more economically efficient, and thus less costly to electricity consumers, than the messy processes required under the Report’s obligation approach.

“Energy efficiency is effectively handballed to governments”

Alan Pears, Senior Industry Fellow, RMIT University

The Review’s approach to the demand side is very focused. Demand response, the capacity to reduce demand at times of extreme pressure on the supply system, is addressed thoroughly. The past under-utilisation of this approach is acknowledged, and the actions of the Australian Energy Market Operator (AEMO) intended to capture some of its potential in time for next summer are outlined.

However, the deep cultural problems within the Australian Energy Markets Commission regarding demand response are not tackled. Instead, the AEMC is asked (yet again) to develop facilitation mechanisms in the wholesale market by mid-2018.

Energy efficiency is effectively handballed to governments. After making some positive comments about its valuable roles, recommendation 6.10 states that governments “should accelerate the roll out of broader energy efficiency measures to complement the reforms recommended in this Review”.

This is a disappointing outcome, given the enormous untapped potential of energy markets to drive effective energy efficiency improvement. But it clearly shows governments that they have to drive energy-efficiency initiatives unless they instruct energy market participants to act.

“It follows the wrong path on greenhouse emissions”

David Karoly, Professor of Atmospheric Science, University of Melbourne and Member, Climate Change Authority

The Finkel Review says many sensible things about ways to improve the security and reliability of Australia’s electricity sector. However, it follows completely the wrong path in what it says about lower greenhouse emissions from the electricity sector and Australia’s commitments under the Paris Agreement. This is disappointing, as Alan Finkel is Australia’s Chief Scientist and a member of the Climate Change Authority.

All economy-wide modelling shows that the electricity sector must do a larger share of future emissions reductions than other sectors, because there are easier and cheaper solutions for reducing emissions in that sector. However, this review’s vision is for “emissions reduced by 28% below 2005 levels by 2030” – exactly the same as Australia’s target under the Paris Agreement. It should be much more.

Australia’s commitments under the Paris Agreement are “to undertake ambitious efforts” to limit global warming “to well below 2℃ above pre-industrial levels”. The Targets Report from the Climate Change Authority in 2015 showed that this means Australia and the electricity sector must aim for zero emissions before 2050, not in the second half of the century, as suggested in the Finkel Review.

Alan Pears has worked for government, business, industry associations public interest groups and at universities on energy efficiency, climate response and sustainability issues since the late 1970s. He is now an honorary Senior Industry Fellow at RMIT University and a consultant, as well as an adviser to a range of industry associations and public interest groups. His investments in managed funds include firms that benefit from growth in clean energy. He has shares in Hepburn Wind.

David Karoly receives funding from the Australian Research Council Centre of Excellence for Climate System Science and an ARC Linkage grant. He is a member of the Climate Change Authority and the Wentworth Group of Concerned Scientists.

Hugh Saddler does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond the academic appointment above.

UPC and Hammond family announce plans for 1,000MW wind farm in Tasmania, and solar and storage.

Rescuers will try to refloat the 9m-long juvenile, which weighs up to 18 tonnes, at Sawtell on Saturday morning

Rescuers are working to save a young humpback whale that washed onto a beach on the New South Wales mid-north coast on Friday. The animal, which is nine metres long and weighs around 18 tonnes, would remain beached at least until the high tide arrives in the evening, experts said.

Beachgoers spotted the whale in the surf at Sawtell Beach south of Coffs Harbour early on Friday and it washed closer to shore at about 7am.

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Trump’s climate stance is blatant and extreme but just as damaging is the daily denial that goes unchallenged, from airport expansion to pub patio heaters. A first step to change is to call it out #DailyClimateDenial

You know things are bad when it takes Donald Trump pulling the US out of the Paris agreement for climate change to be discussed during the UK election. His climate denial is of the extreme and obvious variety: pages were removed from the Environmental Protection Agency website explaining its causes and consequences when he came into office.

Equally if not more damaging, however, is the daily climate denial that passes mostly unremarked all around us. The Institute of Directors recently proposed not one, but two new airport runways for London in a report called Let’s push things forward. It made no mention of the effect on rising emissions and a better title might have been “Let’s push things over the edge”. The oil company BP’s irony free sponsorship of the British Museum’s Sunken Cities exhibition merely highlighted how removed climate now is from our everyday cultural imagination.

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Chief scientist’s report flies in the face of previous recommendations on reducing electricity emissions

Less than two weeks ago, Alan Finkel told the Senate his landmark report would help Australia meet the commitments it made in Paris to reduce its economy-wide emissions by 28% below 2005 levels by 2030.

But his recommendations on the future of the National Electricity Market, released today, appear to fly in the face of those very commitments.

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