”Bite-size Climate Tech" is your go-to source for easy-to-digest content on the latest and most cutting-edge climate technology and topics of the day. With around 5min per per episode, this podcast is for non-engineers and everyday people like myself, to peak into the incredible world of climate tech.
The Fertilizer We Flush Away | Margaret Lumley, Roca Water
Why do we make nitrogen fertilizer, let some of its value end up in wastewater, spend effort removing it, and then manufacture more?
Margaret Lumley, Founder & CEO of Roca Water, joins Bite-Size Climate Tech to explain how battery-inspired electrodes can selectively recover ammonium from wastewater. Together we follow nitrogen through food and water systems, search for an eight-year-old-friendly soup analogy, and explore why resource recovery might make commercial sense for wastewater operators. Margaret also shares what growing up with California droughts and later experiencing Wisconsin floods taught her about water and climate.
Recorded on 6 August 2026. Company milestones are discussed as they stood at recording.
Bite-Size Climate Tech makes complex climate solutions simple, human, and engaging.Support Season 5:https://www.dayzeroproduction.com/bite-size-climate-tech/supportLearn more about Bite-Size Climate Tech:https://www.dayzeroproduction.com/bite-size-climate-techProduced by Day Zero Production
29 Sept 2026
CO₂ to Ethylene with Alex Ip, CERT Systems
What do bananas, shampoo bottles, clothes and aviation fuel have in common?
Ethylene.
It is one of industry’s most useful building-block molecules, and today it is largely made from fossil feedstocks.
In this episode of Bite-Size Climate Tech, I speak with Alex Ip, Co-founder & CEO of CERT Systems, about a different route: using CO₂, water and electricity to make ethylene through direct CO₂ electrolysis.
Alex explains the science with Lego blocks and an “electrolyser sandwich,” then we get into the Season 5 question: why could this be good business?
We talk about why making the same drop-in molecule matters for existing industrial processes, modular production, moving from lab proof towards commercial demonstration, the pathway towards cost competitiveness, and what winning Tencent CarbonX could unlock for CERT.
And underneath all of it is a bigger idea: future generations shouldn’t have to give up useful materials, mobility or quality of life to solve climate change. The challenge is finding a better way to make them.
🎙️ Bite-Size Climate Tech Season 5: Climate Tech Is Just Good Business
Learn more about CERT Systems:
https://co2cert.com/ (https://co2cert.com/)
Explore Bite-Size Climate Tech:
https://www.dayzeroproduction.com/bite-size-climate-tech (https://www.dayzeroproduction.com/bite-size-climate-tech)
Support Season 5:
https://www.dayzeroproduction.com/bite-size-climate-tech/support (https://www.dayzeroproduction.com/bite-size-climate-tech/support)
Reach and audience
Public platform figures. Ratings count people who left a rating, not total listeners.
YouTube views
30,605
Score snapshot 15 Sept 2025
Spotify
5.0 / 5
7 ratings
Podcast Authority Score: 68 / 100
A composite of feed quality, social presence, YouTube performance and engagement. Read the methodology.
Quality
81
Social presence
0
YouTube
76
Engagement
60
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