Sustainability Defined

Sustainability Defined is the long-running explainer podcast from Jay Siegel and Scott Breen, two sustainability professionals who met working in Washington and started the show in 2016 to fix how jargon-heavy the field had become. Each episode takes exactly one concept, from carbon offsets to circular fashion, and breaks it down with a structured definition, an expert guest, and reliably bad puns. The tree-branch episode structure has quietly become a curriculum: listeners work through the catalog like a course. It is the entry point we recommend for anyone who wants to actually understand the vocabulary behind sustainable living.