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Sixty-five MPs have written to the environment secretary urging him to include the measures in his new strategy to tackle the air pollution crisis

A cross party group of MPs is calling on Michael Gove to adopt a clean air bill in his new strategy to tackle the crisis of air pollution in the UK.

Sixty five MPs have written to the environment secretary as he prepares to address the most pressing issue in his intray – a demand by judges for a new air quality strategy by 31 July to cut illegal levels of pollution from diesel vehicles.

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Drivers who fail to give cyclists enough space when overtaking will be pulled over, and officers will explain how to overtake cyclists safely

London’s police force has launched a new initiative to tackle drivers who pass cyclists too closely, using plain clothes officers.

From Friday, the Space for Cyclists initiative will be carried out by UK’s only cycle-mounted police command, the Met’s cycle safety team, after months spent adapting the tactic for London’s roads from a West Midlands Police initiative, introduced last year.

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Environment Secretary Michael Gove plans to pay farmers for protecting the environment and creating rural jobs.

North Lees, Derbyshire The site of the old smelting works felt wholly reclaimed, and as the rain ended the air filled with insects and soon after wrens

The rain started as I crossed the pasture above North Lees Hall, the model, it is widely accepted, for Thornfield Hall in Charlotte Brontë’s novel Jane Eyre. It’s a house the author visited more than once, staying with her friend Ellen Nussey in nearby Hathersage, and the intertwining of the names – thorn being an anagram of north and lee derived from the Anglo-Saxon for field – coupled with the detailed description Brontë gives, are persuasive.

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Big reductions in no-take marine protected areas are being considered, going beyond those recommended by an earlier federal government review

Australia’s marine protected areas look set to be slashed by the federal government, with plans announced for cuts that go beyond those recommended by a review commissioned by the previous Abbott government.

Draft management plans released by the Director of National Parks on Friday propose that large areas of Queensland’s Coral Sea, as well as off the coast of Western Australia, the Northern Territory and New South Wales, will lose or have their protection downgraded, to make way for expanded long-line fishing and seafloor trawling – which have been shown to damage the conservation value of the oceans.

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Moving on from the world's biggest battery in SA, Elon Musk broke the internet week with Tweets about his new, new thing: The Boring Company.

Solar is expected to be a $US1 trillion market within five years, driven by EV uptake, micro-grids and corporate purchases, and as unsubsidised solar and storage reaches cost parity with the grid in most major markets.

Developers of wind and solar projects may try and accelerate their projects to get in in front of the proposed generator reliability obligation.

While Malcolm has been pumping Snowy 2.zero, Craig has been promising death by renewables, Josh reckons we are on track to meet Paris commitments and Barnaby is backing coal.

Battles against takeaway coffee cups, marine plastic pollution and energy wastage will get support from the City of Sydney’s latest round of environmental knowledge exchange sponsorships.

Conservatives may be pushing for new coal generator in north Queensland, but the region is about to become the country's first significant exporter of solar power.

South Miami this week became the first city outside of California to require all new homes to install solar panels on their roofs.

Under a non-exclusive Memorandum of Understanding with JinkoSolar, Greatcell noted it would make available developmental perovskite cells for further evaluation.

Over the past 15 years, the rapid melt of Arctic sea ice has made seabed mapping easier for new territorial claims and fossil fuel exploitation.

The bag was used by astronaut Neil Armstrong to collect the first ever samples of the Moon in 1969.

A recent heatwave in Siberia’s frozen wastes has resulted in outbreaks of deadly anthrax and a series of violent explosions

Strange things have been happening in the frozen tundra of northern Siberia. Last August a boy died of anthrax in the remote Yamal Peninsula, and 20 other infected people were treated and survived. Anthrax hadn’t been seen in the region for 75 years, and it’s thought the recent outbreak followed an intense heatwave in Siberia, temperatures reaching over 30C that melted the frozen permafrost.

Long dormant spores of the highly infectious anthrax bacteria frozen in the carcass of an infected reindeer rejuvenated themselves and infected herds of reindeer and eventually local people.

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The recent decision by Australia’s big two supermarkets to phase out free single-use plastic bags within a year is just the latest development in a debate that has been rumbling for decades.

State governments in Queensland and New South Wales have canvassed the idea, which has been implemented right across the retail sector in South Australia and the Australian Capital Territory.

So far, so good. But are there any downsides? Many of you, for instance, face the prospect of paying for bin liners for the first time ever. And while that might sound tongue-in-cheek, it shows the importance of considering the full life-cycle of the plastics we use.

Pros and cons

On a direct level, banning single-use plastic bags will avoid the resource use and negative environmental impacts associated with their manufacture. It will reduce or even eliminate a major contaminant of kerbside recycling. When the ACT banned these bags in 2011 there was a reported 36% decrease in the number of bags reaching landfill.

However, the ACT government also noted an increase in sales of plastic bags designed specifically for waste. These are typically similar in size to single-use shopping bags but heavier and therefore contain more plastic.

Ireland’s tax on plastic shopping bags, implemented in 2002, also resulted in a significant increase in sales of heavier plastic waste bags. These bags are often dyed various colours, which represents another resource and potential environmental contaminant.

Keep Australia Beautiful, in its 2015-16 National Litter Index, reported a 6.2% reduction in the littering of plastic bags relative to the previous year, while also noting that these represent only 1% of litter.

Meanwhile, alternatives such as paper or canvas bags have environmental impacts of their own. According to a UK Environmental Agency report, a paper bag would need to be re-used at least four times, and cotton bags at least 173 times, to have a lower environmental impact than single-use plastic bags in terms of resource use, energy and greenhouse outcomes.

This illustrates the importance of considering the full life cycle of shopping bags to arrive at an evidence-based decision rather than one based on emotion or incomplete data. I am not suggesting this is the case with plastic shopping bags; I’m just pointing out the value of proper analysis.

Simply banning a certain type of bag, while this may be a good idea in itself, could result in other knock-on impacts that are harder to manage. Replacing shopping bags with heavier, more resource-intensive ones may solve some environmental impacts but exacerbate others.

Plastics, not plastic bags

In a 2016 discussion paper, Western Australia’s Association of Local Governments suggested the focus of action should be plastics in general, not just shopping bags.

As the Keep Australia Beautiful data show, plastic bags are just a small part of a much bigger problem. Many other plastic items are entering the litter stream too.

With this in mind, it pays to ask exactly why we are banning plastic shopping bags. Is it the litter issue, the potential impact on wildlife, the resource consumption, all of the above, or something else? Is it because they are plastic, because they are disposable, or because it saves supermarkets money?

The answers to these questions can guide the development of an effective strategy to reduce the environmental (and perhaps economic) burden of taking our shopping home. With that in place, we can then develop an education strategy to help shoppers adapt and make the scheme a success. But this costs money.

The triple bottom line

There should be plenty of money available. The Victorian state government’s Sustainability Fund, for instance, has A$419 million to spend over the next five years on researching alternatives to shopping and household waste management. Developing a shopping bag strategy would consume only a small part of this and would be money well spent.

The concept of the “triple bottom line” – ensuring that decisions are based equally on environmental, social and economic considerations – needs to be applied to decisions about whether to ban single-use plastic bags, and what alternatives will result. The problem with simply announcing a ban is that this leaves it up to shoppers themselves to work out what to do to replace them.

Evidence-based policy is crucial. We first need to find out how many people already use re-usable bags, whether they always take them to the shops, and what items they put in them. Do people generally know how many times each type of bag should be re-used in order to be an environmentally better choice than the current plastic bags? What’s the best material for re-usable bags, taking into account not only their environmental credentials but also their ability to get your shopping home without breaking?

When it comes to environmental impacts, it’s important not to simply exchange one problem for another. If all we’re doing is swapping between different types of plastic, it’s hard to see how we’re solving anything.

Trevor Thornton 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.

On your way home tonight, you might stop at the supermarket to grab some ingredients for the evening meal. If you’re like many shoppers, you’ll pass through the self-service checkout, scan your items, and hurriedly place them in the conveniently waiting thin, grey plastic bag before finalising the purchase.

At home, the purchases are packed away or lined up for immediate preparation. The plastic bag is scrunched into a little ball and stuffed away with others in your collection, to be used as bin liners or otherwise thrown away. All of these behaviours are, by and large, done without a great deal of thought.

One of the most challenging tasks for marketers is to bring about changes in consumer behaviours that have become habitual, routine and “low involvement” – why spend time stopping and considering various brands of laundry detergent, for instance, when you can just quickly grab the one you’ve always used?

The very nature of habitual behaviour means that responses to the same situational cues happen automatically and with little conscious thought. Habits are powerfully ingrained. One study estimates that around 45% of our daily actions are habitual, and most of our purchases and consumption is of the low-involvement variety.

Repetitive consumer behaviour is a tough cycle to disrupt. And it is the very nature of these habitual responses that make many standard interventions relatively ineffective.

But this is the task facing supermarkets in taking away customers’ access to free plastic bags.

Banning the bags

The recently announced plans by supermarket giants Coles and Woolworths to ban single-use plastic bags seem admirable enough, but the environmental benefits will only be fully realised if the ban drives a permanent change in shoppers’ behaviour.

Many countries have tried a variety of strategies to get rid of single-use plastic bags, including bans, educational campaigns, and levies. Most have had mixed results. There is no overwhelming evidence to suggest that any of these approaches has fully broken shoppers’ disposable bag habit.

Even where use has been dramatically reduced, the environmental impact has been mitigated by unintended consequences such as a 65% increase in the purchase of bin liners, and the disposal of re-usable bags. And despite a general shift in attitude towards environmentally sustainable consumption, this “intention-behaviour gap” still prevails.

Breaking the habit

Here is where some behavioural psychology can be brought to bear on the problem. We know that habitual behaviours are learned and reinforced through repeated responses to particular situations. Theoretically, if these behaviours are learned, they can be unlearned by providing different situations.

One potentially useful technique is called “nudging”. A nudge gives people a gentle prod to change their behaviour, through encouragement rather than coercion. This sometimes controversial subject is most familiar in terms of behavioural economics – a classic example being the small refunds offered by drink bottle recycling schemes – but nudges can be purely behavioural as well as economic.

Behavioural nudges aim to make people stop and think about what would otherwise be an unconscious behaviour. Often this takes the form of a short, simple message. Electricity providers have been known use this method of nudging. Power usage by their customers will drop when shown the usage rate of a similar sized household with a similar number of occupants is more efficient than their own.

But it can also involve a minor adjustment to the environment in which the behaviour occurs. Such a strategy could be applied in supermarkets where “footprints” could lead to reusable bags which are available for purchase. Repeating this over time, will result in consumers associating the footprints with a reminder to ‘bring’ their bags. Varying the location of the footprints, or even their colour or shape, might encourage shopper curiosity and thus increase the likelihood of consciousness about the plastic bag ban.

Economic nudges can also be used to help shoppers quit plastic bags – as in the case of Toronto, which introduced a 5-cent levy on plastic bags. There are many ways to gently encourage shoppers to make better decisions.

Australia’s big shopping brands

Given that much of the problem involves challenging current behaviours, it stands to reason that the big brands’ responses to this question will hinge on what their customers are already used to.

Retailers such as Bunnings and Aldi have never provided their customers with free, disposable plastic bags. Their customers learned quickly from the outset to use alternatives, such as the stash of old cardboard boxes typically found behind the checkouts at Bunnings.

Woolworths and Coles, on the other hand, face a tougher challenge. They are taking something away from shoppers, and some customers may be resentful and resistant to change as a result.

To avoid a repeat of Target’s aborted effort to remove free bags in 2013, Coles and Woolworths might find that the best way to avoid a similar customer revolt is to use in-store cues as behavioural nudges, alongside the economic incentive of offering durable plastic bags for a price. Many consumers will be willing to pay for plastic bag alternatives during the transition phase. Combining this with gentle reminders via the in-store ‘footprints’ will aim to gradually change those low involvement, highly habitual shopping patterns.

Whether economic or non-economic, messages to shoppers need to be as pervasive and repetitive as the ingrained behaviours they are trying to change.

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond the academic appointment above.

A 10-year-old boy's stumble unearthed a prehistoric skull, which he then got the chance to help excavate.

The number fledging from the UK in 2017 is more than the total number for the previous 30 years.