From fashion designers to diplomats, philosophers to activists, our speakers illuminated the wide spectrum of climate change challenges. Many appeared in person; some joined via video – see the lineup below.

Evelyn Acham
Member, Generation Climate Initiative and National Coordinator and Secretary, Rise Up Movement
Alice Aedy
Filmmaker; Co-Founder, Earthrise
Daze Aghaji
Climate Justice Activist
Halide Alagöz
Chief Product and Sustainability Officer, Ralph Lauren
Liz Alderman
Chief European Business Correspondent, The New York Times
Mohamad Al-Jounde
Founder, Gharsah School
Rawaa Ammar
Impact and Sustainability Lead, Resortecs
Matt Anderson
European Culture Editor, The New York Times
Cherrie Atilano
Founder and C.E.O., AGREA Agricultural Systems International
Jade Begay
Climate Justice Campaign Director, NDN Collective
Abhijit Banerjee
Economist, Professor and Co-Founder, Abdul Latif Jameel Poverty Action Lab, M.I.T.
Katrin Bennhold
Berlin Bureau Chief, The New York Times
Marcelo Behar
Vice President of Sustainability and Group Affairs for Natura &Co, member of Transform to Net Zero., Natura & Company
Claire Bergkamp
C.O.O., Textile Exchange
Melanie Bishop
Associate Professor, Macquarie's Department of Biological Sciences
Julia Blocher
Researcher, Potsdam Institute for Climate Impacts Research
Rebecca Blumenstein
Deputy Managing Editor, The New York Times
Nicolas Brown
Filmmaker
Jane Burston
Founding Executive Director, Clean Air Fund
William Butler-Adams OBE
C.E.O., Brompton Bicycle
Kiki Callihan
Co-Director, Relic Plastic
Veronica Chambers
Editor, Narrative Projects, The New York Times
Aya Chebbi
Former African Union Envoy on Youth; Chair, Nala Feminist Collective
Lauren Chin
Impact Coordinator, University of Edinburgh
Ertharin Cousin
Distinguished Fellow, Center on Food Security and the Environment, and Center on Democracy, Development and the Rule of Law
Mya-Rose Craig
Environmentalist and Author
Matt Damon
Co-Founder, Water.org and WaterEquity
Karrie Denniston
Senior Director- Sustainability, Walmart
Es Devlin
Artist and Designer
Sandrine Dixson-Declève
Co-President, Club of Rome
Niall Dunne
C.E.O, Polymateria
Chris Elliot
Professor, Queens University Belfast
Tasneem Essop
Executive Director, Climate Action Network International
Hannah Fairfield
Climate Editor, The New York Times
Barry Fisher
Chief Executive, Keep Scotland Beautiful
Olivia Finch
Portfolio Manager, Ellen MacArthur Foundation
Nicholas St. Fleur
General Assignment Reporter, Stat
Janice Forsyth
Co-Presenter, BBC Radio Scotland
Stephenie Foster
Partner, Smash Strategies
Jerome Foster II
Climate Justice Activist and Executive Director, OneMillionOfUs
Matt Frei
Europe Editor and Presenter, Channel 4 News
Barnaby Francis a.k.a. Bill Posters
Artist-Researcher, Author and Activist
Daphne Frias
Climate Justice and Disability Activist and Member of the Generation Climate Initiative
Thomas Friedman
Author and Journalist, The New York Times
Vanessa Friedman
Fashion Director and Chief Fashion Critic, The New York Times
Vanessa García Polanco
Member, Generation Climate Initiative and Federal Policy Director, National Young Farmers Coalition
Ryan Gellert
C.E.O., Patagonia Works and Patagonia
David Gelles
Corner Office Columnist and Business Reporter, The New York Times
François Gemenne
Director, Hugo Observatory at the University of Liège
Jeffrey Gettleman
Foreign Correspondent, The New York Times
Adrian Glover
Merit Researcher, Natural History Museum
Rei Goffer
Co-Founder and C.S.O., Tomorrow.io
Lorna Gold
Director of Movement Building, FaithInvest
Leandra Gonçalves
Assistant Professor, Federal University of São Paulo
Al Gore
Former Vice President, United States
Nina Gualinga
Climate Activist and Communicator
Doug Gurr
Director, Natural History Museum, London
Ravi Gurumurthy
C.E.O., Nesta
Krishnan Guru-Murthy
Presenter, Channel 4 News
Dylan Hamilton
Climate and Trans Rights Activist and Member, Generation Climate Initiative
Josh Haner
Staff Photographer and Photo Futurist, The New York Times
Matthew Hannon
Senior Lecturer, Strathclyde Business School
Phoebe Hanson
Member, Generation Climate Initiative and Chief Operating Officer, Force of Nature
Finn Harries
Climate Activist and Filmmaker; Co-Founder, Earthrise
Thomas Heatherwick
Founder and Design Director, Heatherwick Studio
Isaias Hernandez
Environmental Educator and Creator, QueerBrownVegan
Philipp Hildebrand
Vice Chairman, BlackRock
Clover Hogan
Founder and Executive Director, Force of Nature
Guy Hudson
Co-Founder and C.E.O., Loam
Freddie Huppé Campbell
Global Hub Program Coordinator, Indigenous Clean Energy
Alex Hynes
Managing Director, Scotland’s Railway
Chris James
Founder, Engine 1
Oliver Jeffers
Artist and Author
Anne Jungblut
Principal Researcher, The Natural History Museum
Andy Karsner
Senior Strategist and Space Cowboy, Google X
Sir David King
Founder and Chair, Centre for Climate Repair, University of Cambridge
Sandra Knapp
Research Botanist, Natural History Museum, London
Cassidy Kramer
Climate and Indigenous Rights Activist and Member of the, Generation Climate Initiative
Jennifer Kuhl
Network and Engagement Lead and Member, Generation Climate Initiative, Global Climate and Health Alliance
Hindou Oumarou Ibrahim
President, Association for Indigenous Women and Peoples of Chad
Sophie Lambin
Founder and C.E.O., Kite Insights
Rt. Hon. David Lammy
Member of Parliament, U.K.
Mark Landler
London Bureau Chief, The New York Times
Lyndsey Layton
Deputy Climate Editor, The New York Times
Kai-Fu Lee
C.E.O., Sinovation Ventures
Tim Lenton
Director, Global Systems Institute, University of Exeter
Lindsay Levin
Founder and C.E.O., Leaders’ Quest
Ruth Maclean
West Africa Bureau Chief, The New York Times
Emtithal Mahmoud
Poet and Goodwill Ambassador, United Nations High Commissioner for Refugees
Poonam Malik
Head of Investments, University of Strathclyde
Michael Mann
Distinguished Professor of Atmospheric Science and Director of the Earth System Science Center, Pennsylvania State University
Wanjira Mathai
Vice President and Regional Director for Africa, World Resources Institute
Erica McAlister
Senior Curator, Natural History Museum
Stella McCartney
Fashion Designer and Founder, Stella McCartney
William McDonough
Chief Executive, McDonough Innovation
Sara Menker
Founder and C.E.O., Gro Intelligence
Robert Metzke
Global Head of Sustainability, Philips
Robin Millington
C.E.O., Planet Tracker
Rebeca Minguela
Founder and C.E.O., Clarity AI
Jennifer Morgan
Executive Director, Gree​​npeace International
Deb Morrison
Activist-Scholar and Founder, CLEAR Environmental
Nick Mulvey
Singer-Songwriter
Simon Mundy
Moral Money Editor, Financial Times
Gonzalo Muñoz
Chilean High-Level Climate Champion, COP25
Michal Nachmany
Founder and C.E.O., Climate Policy Radar
Kumi Naidoo
Human Rights Activist and Speaker on Environmental Justice
Vanessa Nakate
Member, Generation Climate Initiative and Climate Justice Activist
James Napier
Founder, CBN Expert
Divya Nawale
Youth Environmental Champion
Gina Neff
Executive Director, Minderoo Center for Technology and Democracy, University of Cambridge and Professor of Technology and Society, University of Oxford
Luisa Neubauer
Climate Justice Activist and Author
Rachel Nixseaman
Project Operations Manager, YMCA Bellshill & Mossend
Elizabeth Nyeko
Founder and C.E.O., Modularity Grid
Friederike Otto
Senior Lecturer in Climate Science, Grantham Institute for Climate Change and the Environment, Imperial College London
Martin Paley
Co-Founder and Co-Director, Relic Plastic
Martin Palmer
C.E.O., FaithInvest
Ridhima Pandey
Climate Activist
Ian Parsons
Conservation Architect
Alice Pataxó
Climate Activist and Communicator
John Paul Jose
Member, Generation Climate Initiative and Deputy Director General, Zero Hour
Jess Pepper
Climate Reality Leader and Coordinator, Climate Reality UK for COP26
Jennifer Phin
Managing Director, A.C. Whyte and Company
Bertrand Piccard
Chairman, Solar Impulse Foundation
Alison Porter
Portfolio Manager, Janus Henderson Investors
Varshini Prakash
Co-Founder and Executive Director, Sunrise Movement
Silvia Pressel
Merit Researcher and the Senior Research Lead, Life Sciences Department, Natural History Museum, London
Katherine Priestley
Founder and Managing Director, Park Vale Capital
Lavanya Rajamani
Professor of International Environmental Law, Faculty of Law, University of Oxford
Janet Ranganathan
Vice President for Research, Data and Innovation, World Resources Institute
Kate Raworth
Economist and Co-Founder, Doughnut Economics Action Lab
Inge Relph
Executive Director and Co – Founder, Global Choices
Alain Revah
Chief Marketing and Strategy Officer, Ÿnsect
Grant Reid
C.E.O., Mars Inc.
Katie Reid
Children’s Voices Program Manager, Children’s Parliament
Magi Richani
Founder and C.E.O., Nobell Foods
Whitney Richardson
Global Events Manager, The New York Times
Isabel Rivera-Collazo
Assistant Professor Geosciences, University of California, San Diego
Johan Rockström
Director, Potsdam Institute for Climate Impact Research
Bruno Rodríguez
Member, Generation Climate Initiative and Founder, Youth for Climate Argentina
Shirley Rodrigues
Deputy Mayor for Environment and Energy, London
Susan Ruffo
Senior Advisor, United Nations Foundation on Climate and the Ocean
Jacqueline Savitz
Chief Policy Officer for North America, Oceana
Antonina Scheer
Member, Generation Climate Initiative and Research Assistant, Transition Pathway Initiative, Grantham Research Institute for Climate Change and the Environment, London School of Economics
Mark Schleifstein
Environment Reporter, The Times-Picayune | The New Orleans Advocate
Robyn Scott
Co-Founder and C.E.O., Apolitical
Jess Search
C.E.O., Doc Society
Steve Sedgwick
Co-Anchor, “Squawk Box Europe”, CNBC
Somini Sengupta
International Climate Reporter, The New York Times
Joana Setzer
Assistant Professor, Grantham Research Institute on Climate Change and the Environment, London School of Economics
Young Scot, Scotland’s Young People’s Forest
Members, Children’s Parliament
Ignacio S. Galán
Chairman and C.E.O., Iberdrola
Kaime Silvestre
Member, Generation Climate Initiative, Activist and Human Rights Lawyer
Ezekiel Simperingham
Global Lead on Migration and Displacement, International Federation of Red Cross and Red Crescent Societies
Chris Stark
C.E.O., Climate Change Committee
Martin Stepek
C.E.O., Scottish Family Business Association
Mark Stephen
Broadcaster, BBC
Finlay Taylor
Senior Tutor, Royal College of Arts
Peter ter Kulve
President, Home Care, Unilever
Leah Thomas
Founder, Intersectional Environmen­talist
Matt Thompson
Editor, “Headway”, The New York Times
Greta Thunberg
Climate Activist
Nigel Topping
U.K. High-Level Champion for Climate Action, COP26
Mariam Traore Chazalnoël
Senior Policy Officer, United Nations International Organization for Migration
Laurence Tubiana
C.E.O., European Climate Foundation
Paul van Zyl
Co-Founder, The Conduit
Adina Vălean
European Commissioner for Transport, European Union
Gloria Walton
C.E.O. and President, The Solutions Project
Elizabeth Wathuti
Founder, Green Generation Initiative
Rose Wamalwa
Co-Founder, Women’s Climate Centers International
Lydia Wanjiku Kibandi
C.E.O., Lensational
Pam Warhurst
Founder, Incredible Edible
Gary White
Co-Founder and C.E.O, Water.org and WaterEquity
Giles Whittell
World Affairs Editor, Tortoise
Katharine Wilkinson
Climate Author, Strategist, Teacher and Co-Founder, The All We Can Save Project
Ellen Windemuth
C.E.O., WaterBear Network
Beatie Wolfe
Artist and Innovator
Farhana Yamin
Environmental Lawyer
Malala Yousafzai
Co-Founder, Malala Fund
Patrick Youssef
Regional Director, Africa, International Committee of the Red Cross
Vittoria Zanuso
Executive Director, Mayors Migration Council
Mark Zimring
Large Scale Fisheries Director, The Nature Conservancy

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