Illustration of a bird with a speech bubble with another illustration of a bird skull inside it. Text: Tipping points.

In series one, podcast host Peter Knapp, an Imperial research postgraduate studying indoor air pollution, speaks with scientists from multiple disciplines who are concerned about the current state and future of the climate and life on Earth.

In series two, Peter focuses on other aspects of society that have a role to play in raising awareness about climate and ecology. Exploring why a newly qualified pilot would quit before paying back a substantial aviation college debt, and what would make someone stop work as a police officer and instead become an activist.

In each series Peter's guests share their personal stories, explaining what led them to be interested in the environmental and ecological crises. They discuss their opinions on public communication, politics, divestment campaigns, having children, Greta Thunberg, travel, carbon footprints, what they hope to see in the future and much more.

Both series are available to listen to on PodbeanSpotify, AudibleAmazon musicYouTube and TuneIn

Find out more about the host of Tipping Points in this Q&A: Becoming an environmental activist: Q&A with the host of Tipping Points.

Feedback and questions for guests

Please send any feedback on series one, or questions for guests appearing in season two, to the podcast host Peter Knapp at

Please see our privacy notice for the Tipping Points podcast feedback collection.

Tipping Points

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