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To mark the 60th anniversary of the Clean Air Act, we’ve been asking Guardian readers to share their memories and stories of what the UK was like before the act came into force.

• You can see all the contributions – or submit your own – via GuardianWitness

The great smog of 1952 swathed London in a toxic smog of pollution, resulting in thousands of deaths over a four-day period. The Clean Air Act was a groundbreaking piece of legislation that led to the phase-out of coal in Britain’s towns and cities.

Sheila Romain, 88, West Sussex
“Coming home from school one day I caught the bus from Crystal Palace to Dulwich. When we got to Gypsy Hill the bus driver said he couldn’t see well enough to go on. I got off knowing I could walk home. When the driver saw in which direction I was going he asked if he could follow me. So, for the next mile and a half, the bus followed me. This must have been the winter 1946-47.”

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Delayed report by the Climate Change Authority could provide Turnbull with a blue-print for a shift to the centre on critical climate policies. Little wonder that the Far Right has gone into melt-down.

HSBC report says third electric vehicle boom underway, driven by significant drop battery prices and a changing mindset among consumers, industry and governments.

Claxton, Norfolk Ants allow us to reflect upon a chemical realm we can seldom know empirically. They are governed by it

If I set aside the rag-winged rooks and moulting lapwings, and forget the storms that this land has just endured, the morning seems utterly still. I stand to watch a long flotilla of cumulus over the marsh, as beautiful and unmoving as sail ships becalmed in doldrums. There is so little breeze that neither foreground nettle nor the red-tinged Yorkshire fog beyond so much as stirs.

Even with my coarse senses, however, I know that this rain-washed stillness is volatile and densely scented. There is a deer nudging through the reeds that I shall never see, because it navigates by smell.

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California grid operator under-estimated speed of solar uptake by at least 4 years – and the belly of the duck is getting fatter much sooner than expected.

Australia rates number 10 in world in solar capacity per head of population - well behind Liechtenstein, and the mountainous micro-state of San Marino.

The US space agency's Juno probe puts itself in orbit around Jupiter, ready to undertake a survey of what lies beneath the giant planet's obscuring clouds.

The US space agency has successfully put a new probe in orbit around Jupiter.

Fringe political groups such as One Nation, Family First and the Liberal Democrats still reject the evidence that humans are causing climate change

So we’re in that post-election twilight zone where analysts, psephologists and columnists try and pull something cogent out of all the mess of uncertainty.

Who’ll be the next prime minister? Which party will lead and how will they do it? What does it all mean, and did Donald Trump have anything to do with it? What do psephologists do when there’s no election on?

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Authorities to remove carcass of humpback whale on Honeycombs beach because it is a popular surf location and decomposing animal could attract sharks

A 12-metre humpback whale weighing up to 40 tonnes has washed up on the beach near Margaret River prompting a shark warning.

The Department of Parks and Wildlife will remove the whale carcass that washed up on Honeycombs beach in Leeuwin-Naturaliste national park in the WA’s south-west.

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Even at current market prices, various different energy storage options make economic sense for renewable energy projects in some locations, according to new research from MIT.

Milder winters and hotter summers pose a threat to some of Australia's most loved apple varieties.

Solgen Energy has completed the installation of 175MW of ground-mounted and rooftop solar systems across the NBN.

The UK is almost certain to miss its EU 2020 targets for renewable energy, the National Grid says.

ARCHAEOLOGY: Early Polynesian sailors criss-crossed the Pacific for hundreds of years, travelling as far as 2,500 kilometres, according to a new chemical analysis of centuries-old stone tools.

Meet the furry stars of Singapore who live in Marina Bay, the heart of Singapore's central business district.

What has been the human and scientific impact of cloning since Dolly the sheep's birth in 1996?

An electric field could help avoid getting any closer than this. Sharkdiver.com/Wikimedia Commons

A wearable electric shark deterrent can effectively repel great white sharks, according to our independent tests of the device.

The manufacturers of the A$749 Shark Shield Freedom 7TM say it works by emitting an electric field around the wearer. This causes uncomfortable muscle spasms in sharks that swim too close and discourages them from coming into contact.

Our research, published in the journal PLoS ONE, shows that the device does indeed make sharks keep their distance. Upon first encounter with a Shark Shield, all approaching great white sharks were effectively deterred, staying an average of 1.3m away from a baited canister with the device attached.

After multiple approaches, individual great white sharks showed signs of habituation to the Shark Shield, coming an average of 12cm closer on each successive approach. Despite this increase in tolerance, 89% of white sharks continued to be deterred from biting or interacting with the bait.

Don’t take the bait

We carried out our testing in Mossel Bay, South Africa, in 2014. We used custom-built cameras equipped with bait and either an inactive (control) or active Shark Shield. Using a video analysis technique traditionally used to measure the size of fish, we were able to determine exactly how closely the sharks approached the device.

We analysed a total of 322 encounters involving 41 individual white sharks, ranging from 2m to 4m long.

Only one great white shark came into contact with the bait in the presence of an active Shark Shield, and only after multiple approaches. The interaction in question simply involved a bump of the bait canister rather than a full bite. In contrast, bites were common during control trials.

Although the effectiveness of the Shark Shield probably varies between shark species, it is encouraging to note its effect on great white sharks, the species implicated in the majority of fatal incidents worldwide. This suggests it could be an important safety consideration for a range of ocean users such as surfers, divers, spear fishers and open-water swimmers.

We also found no evidence that the Shark Shield attracted sharks from further away, which is a common myth among surfers.

A useful tool

Besides showing that the Shark Shield can ward off sharks, our method provides an accurate way to test the effectiveness of any type of shark deterrent that is currently available or likely to enter the market.

But, most importantly for now, we have finally given the public some evidence that there is an effective way to reduce the risk of a negative encounter with a shark.

Instead of the redundant debate about culling sharks as a response to shark-bite incidents, ocean-goers can now proactively take extra precautions, by using proven technology to reduce their already very low risk of injury.

There are many shark deterrent devices on the market, particularly those that use electric or magnetic fields. But without robust, independent scientific evaluation we can’t be sure which of these products actually work. In fact, not only may some devices not be as effective as others, but it is also possible that some of them could actually attract sharks rather than repel them.

Robust scientific evaluation of these types of devices will help the public make informed decisions about how they can reduce their risk of encountering a shark.

It’s important to note that the likelihood of being involved in a negative encounter with a shark is exceptionally low. As a result, some will argue that the use of expensive technology to mitigate that risk even further is unnecessary. Furthermore, no device is likely to guarantee 100% protection from any species of shark.

But at present, under the conditions in which we tested it, this is one device that does seem to offer a genuine benefit. So if you feel that you need extra protection from sharks when entering the water, this device will offer you exactly that.

This article was written with the help of Channing Egeberg, a University of Western Australia marine euroecology MSc graduate and cofounder of Support our Sharks.

Ryan Kempster received funding from WA State Government Shark Hazard Mitigation Applied Research Program, which provided over $220,000 for this research as part of a larger package to investigate the effectiveness of existing shark deterrents. He is also affiliated with the non-profit shark conservation group Support Our Sharks.

Shaun Collin received funding from the WA State Government Shark Hazard Mitigation Applied Research Program, which provided $220,000 for this research.

YouGov survey of more than 800 people shows 76% want to bring their cities in line with European limits on air pollution

The UK may be on its way out of the EU but more than three-quarters (76%) of people want clean air zones to bring their cities into line with European standards, according to a YouGov poll.

The poll comes as new forecasting suggests London will still breach the limits for another 14 years without further action and the mayor of London, Sadiq Khan, prepares to make a major speech on pollution-cutting measures on Tuesday.

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Male and female mountain chicken frogs that were sole survivors of deadly disease are hoped to begin breeding on Montserrat for the first time since 2009

The last two remaining wild mountain chicken frogs living on Montserrat have been reunited, and are hoped to begin breeding on the Caribbean island for the first time since 2009.

Last month, a project took the last female and relocated her into the territory of the remaining male as part of a 20-year recovery plan for the species, one of the world’s largest and rarest frogs that exists on just two Caribbean islands, Montserrat and Dominica.

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