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ScienceFebruary 12, 2019

How the fertiliser of the future could help save New Zealand’s environment

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Harvard professor Dan Nocera has long been electrifying the scientific world with his work on harnessing the untapped potential of solar energy. But his research into the creation of a new type of fertiliser, shared at the MacDiarmid Institute’s AMN9 conference, could have dramatic implications for New Zealand. Alex Braae reports.

It’s always an interesting question to ask someone what they’d do if the New Zealand government gave them a billion dollars to work on a project. For Harvard University professor Dan Nocera, who has been a Plenary speaker at the MacDiarmid Institute’s AMN9 conference this week, the answer is simple.

He’d build a pilot reactor, two or three stories high, which could house his bionic photosynthesis technology. From there, it could pump out bio-fertiliser that could radically improve crop yields, help sequester huge amounts of carbon and store it in the soil, and dramatically reduce the amount of runoff from farming that ends up in rivers. The kicker? “I wouldn’t need a billion, I’ve built pilots before. I think with $25 million you could get really solid data. I want to get a pilot to the point where a major partner could come in and engineer the hell out of it, and then start widespread implementation.”

In 2011, Professor Nocera’s research team announced they had created an ‘artificial leaf’ – effectively a piece of solar technology that conducted photosynthesis at a much more efficient rate than plants could manage – specifically to separate hydrogen and oxygen. That could have significant benefits in terms of generating hydrogen for fuel – a potential source of energy that could be significantly cleaner than the fossil fuels that currently power the industrialised world.

In 2017, it was the ‘bionic leaf,’ which turns solar energy into biomass and biofuels, using a genetically modified bacteria to do so. The process behind that can also be used to make biofertiliser, which tests have shown to be astonishingly effective. When it was applied to effectively dead soil, it increased the yield of a crop of radishes by 300%. That means it could be used to grow food almost anywhere, even with the most depleted soils. The bacteria doesn’t end up in any of the food, either, but New Zealand’s GE free policy would still be a hurdle

The biofertiliser is also ‘carbon negative’, which means that it helps sequester carbon from the atmosphere back into the soil itself. It’s estimated that if this soil was applied across the USA, more than 900 million tons of carbon could be stored in soil every year – though for scale, the USA produced more than 5 billion tons of carbon in 2017. Currently, around 2% of the world’s energy use goes towards the creation of fertiliser, which produces a huge amount of carbon emissions in the process, because the required hydrogen to make ammonia is taken from natural gas.

“The fertiliser thing has legs,” says Dr Nocera. He likens regular fertiliser to being a bit like sodium chloride – also known as table salt. “It’s an ammonium salt. And so as a salt, it dissolves in water, so you get massive runoffs, it just goes with the water stream. My nitrogen isn’t a salt – it’s a solid biomass in the bacteria, and that only has runoff if the whole particulate soil runs off, which is erosion. So if there’s no erosion, I don’t get any runoff.”

Sound familiar? Environmental activists are currently pointing the finger at fertiliser companies, arguing that the runoff is poisoning waterways. The quality of freshwater has become a source of huge angst for many New Zealanders, and this biofertiliser could help repair some of the damage. It’s also more efficient, given that runoff takes nutrients with it that are useful for plant growth, which makes it very close to being a self contained system.

Currently, pilots are being conducted overseas to build reactors in which this process can take place. In practice, a farmer could even set one of these reactors up at their own farm, or have a movable reactor temporarily visit their farm to drop off fertiliser. That’s the sort of development that would push this from a nice idea, to an actually scalable business model.

Professor Dan Nocera speaking at the MacDiarmid Institute’s AMN9 conference at Te Papa in Wellington (Mark Faamaoni)

What is the government’s role in all of this? Professor Nocera sees it as being to “de-risk” the process, so that then major companies can come in and give it the investment that is needed to take it to market. But why can’t it be governments themselves who scales these projects up, if they’re so important?

Basically, because they don’t have the money to go up against what is described as ‘legacy infrastructure’ – already existing technology that has been heavily invested in by corporate giants, to the point that it reaches economic maturity. It’s one of the huge problems in the drive for clean energy at the moment, that oil companies are so heavily entrenched, that they can’t simply be dislodged – they have to have a carrot dangled in front of them to convince them that switching to something better is worth the effort. 

Currently, because that legacy infrastructure exists, that means there’s basically no market to make the switch. “When I give public talks, everyone thinks that Exxon Mobil is out to kill me, or Shell, and they’re trying to stop this, but they aren’t,” says Professor Nocera. “The reason it’s not penetrating is because there’s no discovery that any of us could make, that would replace a $17 trillion investment.” It’s the major reason why he redirected his research away from a focus on fuel, towards a focus on biomass and fertiliser instead. There is legacy infrastructure around that, but Professor Nocera’s approach could already be relatively economically competitive against it – and that’s especially the case if environmentally damaging externalities were priced into the system.

But because of the success this bio-fertiliser has been shown to have on dead soil, the potential market is huge, and bigger than the existing fertiliser market itself. That’s currently worth about $200 billion worldwide. On the other hand, re-energised soil could be worth hundreds of billions more, given the billion hectares of infertile and degraded soil around the world, and the growing global population.

There’s evidence as well that the government is taking Professor Nocera’s ideas seriously, or at the very least is interested in hearing him out. Professor Nocera has now had a few conversations with officials at MBIE, and has nothing but praise for how the NZ government has committed to tackling climate change. Minister of Research, Science and Innovation Megan Woods, who spoke at the opening of the conference, told the room that “we must actively encourage partnerships between industry and deep science, to develop sustainable innovations, that help New Zealand adopt new technologies and clean energy solutions, which combat the impacts of climate change, resource depletion, and environmental pollution.” She wasn’t speaking specifically about Professor Nocera’s research, but the parallels aren’t hard to spot.

This content was created in paid partnership with the MacDiarmid Institute. Learn more about our partnerships here

Keep going!
One of several girls to turn up to Dr Michelle Dickinson’s workshop in a lab-coat (Photo credit: Macdiarmid Institute, copyright Mark Faamaoni)
One of several girls to turn up to Dr Michelle Dickinson’s workshop in a lab-coat (Photo credit: Macdiarmid Institute, copyright Mark Faamaoni)

ScienceFebruary 11, 2019

Mothers, daughters and overcoming bias in the science world

One of several girls to turn up to Dr Michelle Dickinson’s workshop in a lab-coat (Photo credit: Macdiarmid Institute, copyright Mark Faamaoni)
One of several girls to turn up to Dr Michelle Dickinson’s workshop in a lab-coat (Photo credit: Macdiarmid Institute, copyright Mark Faamaoni)

Does the way science gets passed down through generations make it harder for girls to get into? And what can help change that? Alex Braae reports from the first day of the 9th International Conference on Advanced Materials and Nanotechnology.

Science has long been a bit of a boy’s club. That’s not a figure of speech either – as science knowledge gets transmitted, it has almost always been boys who have been the main beneficiaries.

The barriers to women being part of the scientific world have been both systemic and cultural, but they start early in life. Once upon a time, boys in the school system were formally funnelled into woodworking and metalworking, hard activities that required the learning of hard scientific or engineering knowledge. Girls did home economics, where they learnt the skills needed for a life as a wife and mother. Those days of formal separation are over now, but some cultural biases linger, as they’re passed on generation to generation.

Often that manifests itself in what happens in the home, over and above what happens in the school system. Traditionally, fathers would help their sons out with their science homework, or get them to help out with practical mechanical projects, and instil within them a love of scientific learning. There’s nothing wrong with that of course – it’s good for parents to be involved with the education of their kids. But does it really just have to be fathers and sons? And what are the mothers and daughters up to while that’s going on?

Some of them have been upending that, by heading along to a series of workshops being run at Te Papa, in Wellington. The workshops are hosted by Dr Michelle Dickinson, perhaps more well known to the world as the science communication superhero Nanogirl. They’re among the events aimed at the public being put on for the Macdiarmid Institute’s AMN9 conference, and are in some ways a clever subversion of the old Home Economics classes. There’s a cookbook for mothers and daughters to work from, but it’s a cookbook full of science experiments.

Dr Dickinson says one of the major problems she’s seen with mothers is that they weren’t confident about science during their own childhoods, and have never had the change to learn that confidence as adults. “We do home economics, and we do science, we say one is academic and the other is a vocation. And at no point do we say they’re actually based on the same things.” She says her Kitchen Science cookbook has empowered a lot of parents – but especially a lot of mothers – to start doing science experiments with their kids.

The kids have a whale of the time in the workshops too. One of the experiments involves a spoon with a piece of string wrapped around it, which is then dinged by another spoon – the experiment demonstrates how sound waves travel and are conducted. The girls wrap the end of the string around their fingers, and stick them in their ears, so that the sound of metal on metal sounds deep and resonant, like a gong. One girls face lights up in absolute delight, and Dr Dickinson notices. “I love that face,” she says. “That’s the face of science.”

Associate Professor Nicola Gaston, a University of Auckland physicist who is a co-director of the MacDiarmid Institute, says public events are a crucial part of why the organisation bothers to organise big international conferences in the first place. “Because we’re bringing exciting international researchers to New Zealand, there’s always a sense that we want to share what they’re doing with New Zealanders.” Having events aimed specifically at kids is a bit newer, but something that is happening more, because “it supports people to think of science as being for them.”

Dr Gaston says that events that bring mothers and daughters together aren’t about excluding boys. “It’s just to be really straightforward about the fact that kids often see science as something that is male dominated, and therefore for boys. It’s not the kids fault, what they think sometimes. But having kid focused events helps change that, at an earlier stage.”

University of Auckland Associate professor Dr Nicola Gaston speaking at the Macdiarmid Institute’s AMN9 conference in Wellington (Photo: Mark Faamaoni)

But she says the challenge of overcoming those biases will take a long time, and it’s still very early to say if explicit efforts like this are having an effect. Dr Gaston says unconscious biases still matter enormously in how people see the world, and while there are more women in science than there used to be, changing those attitudes isn’t automatic. “Culture perpetuates itself, by default. You can look at some of the studies that have been done on unconscious bias, and they look dramatic and scary, and they’re reflecting back the attitudes of our grandparents. But then you look at the participants in these studies, and they tend to be college students. And kids perhaps reflect back most naively their perceptions of society.”    

Dr Dickinson says she sees these unconscious biases being passed on all the time, and that’s one of the reasons why she does what she does. “A lot of parents transfer their fears to their kids. Maths is a great example – parents say I wasn’t good at maths at school, so it’s okay that you’re not.” And she says that can often be gendered, with mothers making that excuse for their daughters. “We wanted to prevent that generational fear, which we were seeing lots of.”

Some parents, of course, don’t want the old gender norms to be part of their kids’ lives. Katie Evans is one of the mothers who brought their daughters along to the Science Kitchen event. She did home economics at school, and sometimes wonders what could have happened if other things had been encouraged. Her daughter wants to be an astrophysicist (she’s 8 years old, and turned up in a lab-coat) and so the family have always backed that passion. Her daughter’s aptitude and interest in science was noticed by her school, and she was given the opportunity to go up to the next syndicate, because there was a really science focused teacher there. “A teacher did recognise that keenness for science in her, and so gave her that opportunity. Everyone was really grateful for that.” But she says it’s a concern that for a lot of kids, their interest won’t be noticed in an education system that has to try and get everyone through.

So is the goal of these workshops to create a whole new generation of women who are scientists? Not necessarily, says Dr Dickinson. Rather, the best outcome would be a population full of people who are confident in knowing how science works, and how it can be used. Even if it doesn’t result in more people having careers in science, it would still make the world a better place. She cites the snake oil she sees some people who don’t understand science get sucked into buying, as an example. “We’re bombarded by celebrities selling us potions and lotions, with names of things that are made up, and I just want people to be able to evaluate things, because they’re not intimidated by the long words, and know how things work. Or if they don’t they can figure out how to find that information.”

“I want them to be able to make scientific decisions,” she says. “I want to make choices for me and my children that are based on evidence – a scientifically literate society. And who knows where the next great invention will come from, if we have a scientific and engineering mindset?” Those great breakthroughs become much more likely when half the population doesn’t feel excluded from birth.

This content was created in paid partnership with the MacDiarmid Institute. Learn more about our partnerships here