Listen On Demand  |  2021—2022

400 Seconds Per Podcast brings you tiny talks on a big deal: our relationship with the non-human world.

Each episode interviews extraordinary women leading hope and change in the Climate Emergency… in 400 seconds flat.

The podcast is part of the 400 Parts Per Million project.

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We speak to Tessa Clarke, Co-Founder and CEO of OLIO, about the often under-appreciated threat of food waste to our planetary wellbeing and survival. 

When we think of climate culprits, deforestation and fossil fuels come quickly to mind. But food waste is one of the biggest problems facing the planet.

For this episode, Jo Mary Watson spoke to Tessa Clarke, co-founder of OLIO – the number one free sharing app, whose 5 million users have so far shared over 34 million portions of food, and saved over 5 billion litres of water.

olioex.com  |  @olio.app


We speak to Sarah Harmer, musician and environmental activist, about the power of arts in activism, and how patience can sometimes be as valuable as urgency in addressing climate emergency.

Sarah Harmer is one of Canada’s most acclaimed singer-songwriters, with a catalogue of work tethered to the nuances of the natural world.

But what do you do when your own environment is threatened? In 2005, Sarah began campaigning to protect Mount Nemo, in southwest Ontario, from commercial exploitation  including playing a hiking tour along the Niagara Escarpment, which was later released as the Juno-award-winning film Escarpment Blues.

sarahharmer.com  |  @sarah_harmer


Alina Burwitz speaks to Maria Westerbos, founder of the Plastic Soup Foundation, about the problem of plastic, possible solutions, and navigating industry pushback.

It’s in the soil and your lungs. It’s in deserts and in blood. It’s on mountains and in stomachs. It’s in the oceans and your skin.

So what do we do about a planet addicted to plastic? This is the question being asked by the Plastic Soup Foundation, a global non-profit working to combat plastic pollution at its source.

plasticsoupfoundation.org  |  @mariawesterbos


Ellie Sammer speaks to Ella Daish, founder of the End Period Plastic campaign, about the illusion of choice, the dangers of greenwashing, and the importance of never giving up.

The End Period Plastic campaign calls on leading brands to remove plastic from their period products, and is having significant impacts on the industry.

Thanks to Ella and her supporters, the likes of Sainsbury’s, Aldi and Superdrug have all stopped production of their own-brand plastic tampon applicators, saving 17 tonnes of single-use plastic a year.

elladaish.com  |  @ella_daish


We speak to Jemima Hartshorn, founder of Mums for Lungs, about the problem of air pollution, what we can do to tackle it, and why there are reasons to be hopeful.

The Climate Emergency can often seem distant and detached. A story on our screens from far-off shores. But what do you do when it turns up on your doorstep?

This is the question Mums for Lungs began to ask in 2017. They’re a grassroots organisation from Brixton, campaigning for clean air for everyone.

mumsforlungs.org  |  @MumsForLungs


We speak to Beth Collier, founder of Wild in the City, about nature’s role in our emotional health, and how to refocus eco-anxiety into positive energy.

The natural world is increasingly described as a health service  beneficial to physical and emotional wellbeing. But what happens for those who experience eco-anxiety? And how do we maintain a healthy relationship with our environment in the shadow of the Climate Crisis?

Beth Collier founded Wild in the City in 2013, which promotes connecting with nature as an antidote to the stresses of urban living.

wildinthecity.org.uk  |  @WildintheCity1


Natalie Butler speaks to Marinel Ubaldo about climate leadership, localised engagement, and the importance of resilience in the face of environmental trauma.

How do you fight for a safe environment in the face of devastating forces of nature?

Marinel Ubaldo had just turned 16 when Super Typhoon Haiyan destroyed her village in the Philippines in 2013.

She is now a leading climate activist on the world stage, propelling change for marginalised communities in the Global South. Marinel has spoken at COP21, been trained as a Climate Reality Leader by Al Gore, and is Country Coordinator for the Philippines at the UN’s COY16.