Rnz: Our Changing World

New Zealand is a land formed by volcanoes, including some still active. Claire Concannon meets a researcher analysing ash deposits to determine if a future eruption might have dangerous levels of hazardous chemicals. Plus, she learns about a voyage to Vanuatu and the Solomen Islands to study the gases and ash of an active volcanic chain there. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Researchers continue to study New Zealand’s active volcanoes like Whakaari and Ruapehu to try to understand their patterns of eruptions.When Hunga Tonga Hunga Ha‘apai, just north of Tonga’s main island, erupted in 2022 it caused a worldwide tsunami. Ellen Rykers dug into the science behind the phenomenon.The work of the National Geohazard Monitoring Centre is to keep on eye on earthquake, volcano, landslide and tsunami hazards 24 hours a day, 7 days a week.Auckland is built on a network of volcanoes, and underground lava caves.Guests:Dr Jenni Hopkins, Vict

Phase two of Predator Free Wellington’s groundbreaking project to rid our capital of rats is well underway. They’ve learned a lot from their work on the Miramar Peninsula, but with this new chapter comes new challenges – not just backyards, but a hospital, and even a zoo! Charlie Dreaver meets some of the team out fighting this battle on multiple interesting fronts. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:The target for Wellington to become New Zealand’s first predator-free city was announced by Conservation Minister Tama Potaka in March, as part of a Predator Free 2050 strategy update.In November last year the government added feral cats to the Predator Free 2050 list of targeted predators, likely in response to RNZ’s In-Depth team’s reporting about the destruction they cause, and a pre-election promise.Learn more about other large predator removal projects such as Predator Free Rakiura and Predator Free South Westland, and the plan

Scientists had long been exploring RNA technology as a way to make vaccines before it had it’s breakout appearance during the Covid-19 pandemic. Since then, interest in the potential uses of RNA to make vaccines and disease treatments has bloomed. In late 2023 a government-funded platform began work to enhance New Zealand’s capacity to design and make RNA. Three years in, how is the platform going? Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:RNA interference (RNAi) technology is being investigated to help honey bees fight off the varroa mite.US based Dyne Therapeutics conducted a clinical trial study of their RNA-based therapeutic for myotonic dystrophy in New Zealand.Our Changing World covered how the new RNA vaccine tech works in 2021.Dr Lisa Connor spoke to RNZ’s health reporter Ruth Hill last August after the US made funding cuts to their RNA vaccine research.Guests:Dr Lisa Connor, Malaghan Institute of Medical ResearchDr Rebecca

One peninsula to the north of the Bay of Islands is home to an estimated three thousand Northland brown kiwi. The Pest Free Purerua-Mataroa project aims to reduce predators numbers on the peninsula and defend its narrow neck from re-invasion. Working across a patchwork of landuse and landowners, the team are using AI traps and technology to help catch the remaining pests. But one feral cat continues to elude them, and the ongoing threat to kiwi from pet dogs is proving tricky to solve. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Northland kiwi are a genetically distinct subspecies of the North Island brown kiwi, whose numbers are doing pretty good in recent years, due in large part to Operation Nest Egg facilities like the National Kiwi Hatchery.Predator Free South Westland is also working across different land types and usages in their bid to remove pests from a huge area.Wellington is set to be New Zealand’s first predator-free city, wi

Could the answer to the current fuel crisis be right under our noses? On Our Changing World this week, Sharon Brettkelly talks to some of the scientists analysing ultramafic rocks in places like Lake Pupuke on Auckland’s North Shore and gases from various hotspots around the country, in the hopes that one day hydrogen could power local communities. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:New Zealand already has hydrogen trucks on our roads and active hydrogen refueling stations. However, some critics say battery technology is a better way to decarbonise. After delays from an international supplier, diesel trucks are being converted to hydrogen in New Zealand. Professor Allan Blackman looks at how the Hindenburg disaster has haunted the development of hydrogen technology and why that might be changing. And Jesse talks with Dr. Linda Wright from the New Zealand Hydrogen Council about if hydrogen could displace diesel.Guests:Kevin Faure,

The World Health Organisation has set an ambitious goal to eliminate cervical cancer. New Zealand health experts are optimistic we can do it, but suggest there are challenges to achieving that aim.Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Listen to The Panel Plus with Wallace Chapman, discussing the release of the Cancer Society's election manifesto and treatment options for cancer.Read about the Matariki Fund's plans to eliminate cervical cancer across the Pacific.RNZ's Māori issues reporter Pokere Paewai wrote this article on the need to extend free cervical screening.The efficacy of the HPV vaccine was discussed on Morning Report, following a study which showed a 60% reduction in cervical cancer.Guests:Professor Bev Lawton (Ngāti Porou), is founder/director of Te Tātai Hauora o Hine (the National Centre for Women’s Health Research Aotearoa) at Victoria University of WellingtonNicola Coom, Chief Executive of

Today kākāpō breed on three remote islands, each bird wears a transmitter and they are carefully monitored and minded. But the ultimate goal of the kākāpō recovery programme is to restore the mauri of the kākāpō – to have them back in our forests as wild, nameless birds. What are the steps to get there, and how can science help keep kākāpō safe through this transition? Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Kākāpō need new habitat, could fenced ecosanctuaries be an option? That’s why kākāpō were released into Sanctuary Mountain Maungatautari in July 2023, to start a trial of how they would do in this new, mainland, North Island habitat. A year later, there had already been a lot of lessons learned.One of the possible future habitats mentioned by Deirdre Vercoe is South Westland, where a massive effort is underway to clear stoats, possums and rats from a huge area.For all the details about this record-breaking breeding season, listen

So far, 2026 has been the biggest kākāpō breeding season of all time, with more chicks hatched than ever before. The current challenge is to keep them all healthy as they grow into juveniles, and get added to the adult population. But what comes after that? Claire Concannon reports on the future of kākāpō from one of the breeding islands. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.…Go to this episode on rnz.co.nz for more details

The food you see on the supermarket shelves doesn't end up there by accident. It's often been rigorously tested for likeability. This week on Our Changing World, Liz Garton finds out about the science behind those decisions, given that individual taste can be very varied. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Export markets are a key consumer group. Look at who’s eating our food with this story from RNZ’s Farah Hancock.Our Changing World looked at how science can help pair foods with the School of Chemical Science at the University of AucklandFinding a Psa-V-tolerant golden kiwifruit was one of the success stories from the Consumer and Health sciences team. Claire Concannon looked at the ongoing efforts to prevent the disease from getting to the South Island. Guests:Christina Roigard, Science Team Leader – Sensory & Consumer Health, New Zealand Institute for Bioeconomy Science LimitedDavid Jin, Scientist, Health and Consumer Sci

In 2010 the Psa-V bacterial disease was found in a Bay of Plenty kiwifruit orchard. This was the beginning of a terrible ordeal for many kiwifruit growers. It devastated crops, resulting in the loss of hundreds of jobs, and hundreds of millions of dollars. But though it spread to some other areas in the North Island, it never made it across the Cook Strait. Claire Concannon learns about the science behind keeping this microbe out of Te Waipounamu. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:The Plant and Food Research (today the Bioeconomy Science Institute) team who worked on science to help with the kiwifruit Psa crisis won the Prime Minister’s Science Prize in 2017.In 2012 Alison Ballance reported on the hunt for resistance genes so kiwifruit plants could be more resilient in the face of this bacteria.As In-Depth reporter Farah Hancock detailed earlier this year, 95% of the kiwifruit grown here are actually exported - an earner of $4.5

Ketamine was first developed as an anaesthetic, and today is taken by some as a party drug. But since 2000, research has emerged showing it is also helpful as a medication for some people with treatment-resistant depression. While initial studies used ketamine injections, recent research has shown the advantages of taking it in oral form. Now clinical trials are underway to determine if a New Zealand-developed ketamine pill is safe and effective enough to get the regulatory tick. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.…Go to this episode on rnz.co.nz for more details

In the Auckland suburb of Mt Albert there's a particular brand of doomsday prepping going on. Our Changing World visits the Bioeconomy Science Institute to meet some scientists figuring out how to build an army of Samurai Wasps just in case Aotearoa is invaded by Brown Marmorated Stink Bugs.Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:MPI's website has more detail on the Brown Marmorated Stink Bug and what to do if you find one.From December 2025 a new biosecurity inflight video about being vigilant is being played to incoming visitors.Our Changing World did a deep dive into the impact BMSB would have on New Zealand, back in 2019. Guests:Dr Gonzalo Avila, Senior Scientist - Biological Control, New Zealand Institute for Bioeconomy Science LimitedKarina Santos, Senior Research Associate, New Zealand Institute for Bioeconomy Science LimitedDr Scott Sinclair, Manager, Operational Readiness - Plant & Environment, Biosecurity New Zea

Our Changing Word heads to Whangārei to speak to a Northland Regional Council scientist whose been using stormwater drains to estimate the scale of our plastic pollution problem. Plus, just outside Christchurch, one of New Zealand’s biggest lakes is home to the ‘canary in the coalmine’ of wetlands. The secretive and elusive Australasian bittern seems to be in trouble - how can we help? Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Join Alison Ballance on a kayak across a lake to listen to some booming bittern crooners.Listen to the nine to noon interview with John Sumich about the 2025 Matuku muster.The research into microplastics was part of the AIM2 project, which was reported on in 2021 as part of the OCW episode ‘Unwelcome visitors’.Another source of microplastics is textile waste, but an international project is looking to a future where our clothes are fully biodegradable.Guests:Richard Griffiths, Northland Regional CouncilPeter Langla

In Dunedin the local tree crop association has been looking after a heritage apple orchard, but some mixed up labels meant they weren’t quite sure what varieties they had. A chance encounter at a public open day sets one young researcher on a scientific quest to ID them all. Plus, in a nursery in Rotorua, a propagation scientist is figuring out the best way to grow a native tree from cuttings. Go to this episode on rnz.co.nz for more details

Take a (very) large egg, some insects (plus specially developed food), and a safe place to put on weight for a while. This is how you grow a kiwi, and improve wild survival rates from 5% to 65%. With over 2,600 hatches across their 30 year history, the National Kiwi Hatchery have a lot of experience under their belt, but there's always more to learn from our iconic national bird. Our Changing World visits the hatchery to learn how they combine conservation and eco-tourism to help grow kiwi numbers. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Operation Nest Egg has also been a great success for the rowi kiwi, the only remaining wild population of which lives in Ōkārito on the South Island’s West Coast.In July 2025 little spotted kiwi were found on New Zealand’s mainland for the first time in 50 years. Two chicks and eggs were subsequently brought to Willowbank Wildlife Reserve in Christchurch to allow them to get to stoat-proof weight.With

In the Kaimai Mamuku ranges iwi-led conservation projects are tackling pests, removing weeds and planting natives to restore their whenua. Ngāti Hinerangi’s Wairere Mahi project has been trapping around the Wairere falls, and restoring a nearby system of lakes. The projects were born from the Jobs for Nature fund established by the government during the Covid-19 pandemic. But with that fund now finished where will the money to support future conservation work come from? The Manaaki Kaimai Mamuku Trust supporting these projects has some ideas. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Jobs for Nature also supported an iwi-led wetland restoration project just outside Dunedin.In 2024 The Detail spoke to a number of Jobs for Nature supported projects that were nearing the end of their funding.The Turning Point video series followed some of the kaimahi working on different Jobs for Nature projects across Aotearoa.Country Life’s Dollars fo

A native species is taking over a jewel-in-the crown marine reserve. But what can be done? Centrostephanus, the long-spined urchin, is munching its way through the world-renowned rock walls and kelp beds of the Poor Knights Islands. DOC, University of Auckland scientists and a local hapū are running removal trials to investigate whether this might be a way to manage its march. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.…Go to this episode on rnz.co.nz for more details

New Zealand is third in the world for the number of orbital rocket launches from our shores, sitting just behind the US and China. Phil Vine discovers some of the challenges raised by our push into the unknown and how it is changing the final frontier.Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Through a science experiment on the ISS, New Zealand researchers have been taking advantage of the unique conditions in low earth orbit to investigate commercial opportunities. While New Zealand is well known as a place from which to launch rockets, we do not have a lot of our own hardware in space (the University of Auckland does have TPA-1 CubeSat). But that might be about to change.Tech bros turned space bros like Elon Musk are making big waves out in orbit. The latest news is that Musk is hoping to harness the sun through satellites to power AI data centres.The New Zealand government's biggest investment in an international space missio

We know there are issues with sustainability within the fashion industry - can science help create a better future? Claire Concannon visits the Bioeconomy Science Institute in Rotorua to learn how New Zealand scientists are contributing to a massive multi-national project aimed at shaping the textile industry of tomorrow. Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:UPWEARS has their own research project page if you want to learn more.Learn more about how the Bioeconomy Science Institute (formally Scion) is figuring out how to make new materials and products using bio-waste products rather than fossil fuels.The rise of synthetic fibres impacted the wool industry here in New Zealand, although some entrepreneurs and weavers are making it work for them.Guests:Dr Yi Chen, Bioeconomy Science Institute, and UPWEARSDr Robert Abbel, Bioeconomy Science Institute, and UPWEARSSean Taylor, Bioeconomy Science Institute, and UPWEARSLouise Le Gall, Bioec

Since 2018 there's been a massive effort underway to clear over 110,000 hectares of South Westland of possums, rats and stoats. As the pest numbers have dropped the native flora and fauna seem to have flourished. The eradication stage is now nearing completion, and the focus is switching to maintenance. What will it take to keep the pests out long-term? And what can be learned from this large-scale project that could be used elsewhere in Aotearoa? Sign up to the Our Changing World monthly newsletter for episode backstories, science analysis and more.Learn more:Read/Listen to the rest of the reports from Tess Brunton’s reporting trip to the West Coast, about the eradication project, the work of species dogs, the feedback from tour operators and how rowi, New Zealand’s rarest kiwi, has been helped come back from the brink.For more on the use of AI in pest management project, listen to how the Southern Lakes Sanctuary team have been making use of it at Wye Creek.Guests:Chad Cottle, Predator Free South WestlandEt