Earth – Our Planetary Life Support System - Professor Helen Czerski

Planet Earth is an intricate and interconnected system, with some fundamental rules that we usually ignore. But we are part of our planet, not separate to it or just perched on top of it. This lecture will consider the two primary rules of Earth: that energy continually flows through the system (in from the Sun and then out again to space) and that matter/atoms must be continually recycled and use these to build up an outsider’s view of our planet.This lecture was recorded by Helen Czerski on the 11th of September 2025 at Barnard's Inn Hall, LondonDr Helen Czerski is a physicist and oceanographer with a passion for science, sport, books, creativity, hot chocolate and investigating the interesting things in life. She is an Associate Professor at the Department of Mechanical Engineering at University College London and her research focus is the physics of breaking waves and bubbles at the ocean surface. These bubbles change underwater sound and light, help transfer gases from ocean to atmosphere (helping the ocean breathe) and also eject ocean material into the air. She has spent months working on research ships in the Antarctic, the Pacific, the North Atlantic and the Arctic, and is an experienced field scientist. The transcript of the lecture is available from the Gresham College website: https://www.gresham.ac.uk/watch-now/life-supportGresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham College's mission, please consider making a donation: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-today Website:  https://gresham.ac.ukX: https://x.com/GreshamCollegeFacebook: https://facebook.com/greshamcollegeInstagram: https://instagram.com/greshamcollegeBluesky: https://bsky.app/profile/greshamcollege.bsky.social TikTok: https://www.tiktok.com/@greshamcollegeSupport Us: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-todaySupport the show