Based in London, UK

Former CEO of Unilever — where he delivered 300% shareholder returns while making Unilever the world's most sustainable company for eleven consecutive years — co-founder of IMAGINE, co-author of Net Positive: How Courageous Companies Thrive by Giving More Than They Take, and ranked #1 on the Thinkers50 2025 ranking alongside Andrew Winston. Throughout 2025-2026, Polman was one of the most active and visible sustainability voices on LinkedIn, posting consistently on clean energy progress, corporate ESG responsibility, gender equality, and the importance of maintaining momentum on climate action despite political headwinds. His February 2026 post noting that clean energy represented 96% of new US electricity generation in 2025 despite political rollbacks was widely shared. The most credible and commercially grounded voice on the business case for sustainability globally.

Based in Greenwich, Connecticut, USA

Corporate sustainability strategist, co-author of Net Positive with Paul Polman, author of The Big Pivot and Green to Gold, and one of the most rigorous and practically useful voices on how companies actually implement sustainability strategy rather than just commit to it. Ranked #1 on Thinkers50 2025 alongside Polman. Throughout 2025-2026, Winston's writing, speaking, and LinkedIn commentary on the difference between genuine ESG leadership and greenwashing continued to be among the most cited sustainability business content available. His work provides the operational bridge between Paul Polman's visionary positioning and what sustainability professionals in large organisations can actually do on Monday morning.

Based in London, UK

Former Executive Secretary of the UN Framework Convention on Climate Change and one of the two architects of the 2015 Paris Agreement — the most consequential international climate agreement in history — founding partner of Global Optimism, co-author of The Future We Choose, and co-host of the Outrage + Optimism podcast with Tom Rivett-Carnac and Paul Dickinson. Throughout 2025-2026, as the US withdrew from climate commitments again, Figueres's combination of institutional authority, genuine policy expertise, and her trademark "stubborn optimism" continued to make her the most important voice maintaining global confidence that the energy transition is both necessary and achievable. The person who, more than any other individual, saved the Paris Agreement through sheer diplomatic will — and who continues to use that credibility daily.

Based in Oxford, UK

Economist, author of Doughnut Economics: Seven Ways to Think Like a 21st-Century Economist, and creator of the doughnut model — the economic framework that balances human wellbeing within planetary boundaries, now formally adopted as the economic framework for the city of Amsterdam and used by governments, businesses, and educators globally. Throughout 2025-2026, Raworth remained the most intellectually rigorous voice on the fundamental question that sustainability ultimately asks: what does a genuinely sustainable economy look like, and how do we measure progress toward it? Her framework's adoption continues to spread across cities, universities, and organisations worldwide, making her influence practical rather than merely theoretical.

Based in Potsdam, Germany

Director of the Potsdam Institute for Climate Impact Research, co-developer of the Planetary Boundaries framework — the scientific model that defines the nine Earth system boundaries within which humanity can safely operate — and one of the most credentialed and publicly engaged Earth scientists working in sustainability policy. Throughout 2025-2026, as multiple planetary boundaries continued to be breached, Rockström's research and public communication on what the data actually shows about Earth system stability continued to be essential reference material for policymakers, business leaders, and sustainability professionals globally. The scientist whose work provides the empirical foundation for why sustainability is non-negotiable.

Based in London, UK

Former UN High-Level Climate Champion for COP26, architect of the Race to Zero and Race to Resilience campaigns — which mobilised thousands of companies, cities, and regions to commit to credible net-zero pathways — and one of the most practically experienced voices on what corporate climate action at scale actually requires. With 25,000+ LinkedIn followers and an active posting cadence throughout 2025-2026 on decarbonisation, city sustainability, and the consequences of weather disasters, Topping continued to be one of the most important bridges between the UN climate process and the business community. His direct operational experience building the largest ever coalition of non-state climate actors gives his voice a practical authority that pure advocates cannot match.

Based in Lubbock, Texas, USA

Climate scientist, Chief Scientist at The Nature Conservancy, Professor at Texas Tech University, and the most effective climate communicator in the English-speaking world — specifically for her ability to reach audiences who are sceptical of or disengaged from mainstream climate messaging, including conservative and faith communities. Author of Saving Us: A Climate Scientist's Case for Hope and Healing, TIME's 100 Most Influential People. Throughout 2025-2026, Hayhoe's social media presence, speaking, and media appearances continued to make the case for climate action in a way that transcends political polarisation — an increasingly rare and valuable skill during a period when climate science became more politically charged than ever.

Based in Lexington, Massachusetts, USA

Founding Chairman of the Sustainability Accounting Standards Board (SASB), Professor of Management Practice at Saïd Business School, University of Oxford, and one of the most rigorous academic voices on ESG reporting, integrated reporting, and the financial materiality of sustainability information. Throughout 2025-2026, as ESG reporting frameworks faced political backlash in the US while simultaneously being codified into law in Europe, Eccles's balanced, evidence-based commentary on what good ESG reporting actually requires — and what distinguishes it from politicised posturing in either direction — was among the most cited academic contributions to the ESG governance conversation. The most credentialed academic voice specifically on the intersection of sustainability and financial reporting.

Based in New York City, NY, USA

Chairman and CEO of BlackRock — the world's largest asset manager with over $10 trillion in assets under management — and the most commercially powerful voice in the global ESG investment conversation. His annual letters to CEOs have, since 2018, been among the most widely read and debated documents in corporate governance globally. Throughout 2025-2026, as BlackRock navigated significant political pressure from US state governments opposing ESG investing, Fink's public position on the long-term financial materiality of climate risk — and his navigation of the tension between fiduciary duty and political pressure — made him the most consequential single individual in determining how much capital flows toward or away from sustainable investments globally.

Based in New York City, NY, USA

Founder of the Coalition for Inclusive Capitalism, CEO of E.L. Rothschild, and one of the most senior and connected voices making the case for inclusive, stakeholder capitalism as an alternative to short-term shareholder primacy. Throughout 2025-2026, de Rothschild's convening power — bringing together heads of state, CEOs, and institutional investors around the practical implementation of stakeholder capitalism — continued to make her one of the most influential behind-the-scenes forces in global ESG governance. Her combination of financial credibility and genuine commitment to systemic change gives her access to decision-makers that pure advocates cannot reach.

Based in County Mayo, Ireland

Former President of Ireland, former UN High Commissioner for Human Rights, Chair of The Elders, and founder of the Mary Robinson Foundation — Climate Justice — and the most senior and credentialed voice connecting climate change and human rights in the global conversation. Throughout 2025-2026, Robinson's continued advocacy for climate justice — the argument that climate change disproportionately harms those least responsible for it — remained essential in a policy environment where economic interests often dominated climate discussions. Her moral authority, grounded in decades of the most senior international public service, makes her one of the few voices that consistently elevates the human rights dimensions of sustainability beyond rhetoric.

Based in San Francisco, California, USA

Former US Vice President, founder of The Climate Reality Project, co-founder of Generation Investment Management, author of An Inconvenient Truth and Our Choice, and the individual who more than any other single person made climate change a mainstream global concern. Throughout 2025-2026, as US climate policy reversed dramatically, Gore's Climate Reality Project's continued training of climate advocates globally and his public commentary on the gap between political setbacks and the irreversible momentum of the clean energy transition made him one of the most important voices maintaining public awareness of climate urgency. His combination of political experience, financial credibility through Generation Investment Management, and decades of climate advocacy gives him unique multi-domain authority.

Based in Lausanne, Switzerland

Psychiatrist, explorer, Solar Impulse Foundation founder, and the person who first flew around the world in a solar-powered aircraft — demonstrating practically that clean technology is not a future aspiration but a present reality. Throughout 2025-2026, his Solar Impulse Foundation's labelling of 1,000+ profitable clean technology solutions continued to provide businesses and governments with a practical catalogue of solutions that are both environmentally effective and commercially viable. His unique combination of explorer credibility, scientific rigour, and genuine optimism about clean technology makes him one of the most compelling and unusual voices in the sustainability space — someone who proves his arguments through action rather than advocacy.

Based in N'Djamena, Chad

Indigenous rights advocate, environmental activist, Co-Chair of the International Indigenous Peoples Forum on Climate Change, and one of the most important voices ensuring that indigenous communities — who protect 80% of the world's remaining biodiversity despite representing only 5% of the global population — are represented in global climate negotiations. Throughout 2025-2026, Ibrahim's advocacy at international climate forums, her participatory mapping work in Chad, and her public communications on the frontline impacts of climate change on indigenous communities continued to make her one of the most morally compelling and practically important voices in global sustainability. A voice that ensures the conversation never loses sight of who climate change actually harms most.

Based in Kinsale, Ireland

CEO of Change by Degrees, climate scientist, author of How to Save Your Planet One Object at a Time, and one of the most practical and accessible sustainability voices on LinkedIn with an engaged following built on actionable, positive content. Throughout 2025-2026, Shine's videos and posts on how individuals and organisations can make meaningful sustainability changes continued to generate significant engagement — her approach combining scientific credibility with genuine optimism and practical specificity standing out in a space often dominated by either technocratic complexity or doom-focused messaging. One of the most effective sustainability communicators working specifically for a professional LinkedIn audience.

Based in Devon, UK

Former Senior Advisor to Christiana Figueres at the UN Framework Convention on Climate Change and co-architect of the Paris Agreement strategy, founding partner of Global Optimism, co-author of The Future We Choose, and co-host of the Outrage + Optimism podcast. Throughout 2025-2026, Rivett-Carnac's combination of direct Paris Agreement experience and his accessible public communication on climate strategy continued to make him one of the most practically authoritative voices on what genuine climate leadership requires from both governments and corporations. His podcast — one of the most widely listened-to climate podcasts globally — reached hundreds of thousands of sustainability professionals throughout the review period.

Based in Oxford, UK

Dean of The Fletcher School at Tufts University, former CEO of Sustainable Energy for All, former Special Representative of the UN Secretary-General for Sustainable Energy, and one of the most senior and experienced voices on the intersection of energy access, climate change, and sustainable development. Throughout 2025-2026, Kyte's academic leadership, policy commentary, and media appearances on the geopolitics of clean energy transition continued to make her one of the most credentialed voices on what a just and practical energy transition actually requires — particularly for developing nations who are most vulnerable to climate impacts while having contributed least to historical emissions.

Based in Boston, Massachusetts, USA

CEO and President of Ceres — the nonprofit that works with the world's most influential investors and companies to build leadership and drive solutions to the world's greatest sustainability challenges — and one of the most practically experienced voices on sustainable finance, corporate climate accountability, and what investor pressure can actually achieve. Throughout 2025-2026, as ESG investing faced political headwinds in the US, Lubber's continued leadership of Ceres's investor engagement work — representing trillions of dollars in institutional investor assets — made her one of the most consequential practitioners in the sustainable finance space. A builder of actual leverage rather than a commentator on what leverage should look like.

Based in Ottawa, Canada

Former Governor of the Bank of England and the Bank of Canada, UN Special Envoy for Climate Action and Finance, author of Value(s): Building a Better World for All, and currently Prime Minister of Canada following the 2025 federal election — making him the most senior elected leader in the world with deep, practitioner-level expertise in sustainable finance and climate economics. Throughout 2025-2026, Carney's Glasgow Financial Alliance for Net Zero (GFANZ) work, his writing, and his political ascent made him the single most important figure at the intersection of mainstream finance and climate policy globally. His move into elected office gives the sustainability and ESG conversation a credibility at the highest levels of government it has rarely had before.

Based in Tokyo, Japan

Former Chief Investment Officer of Japan's Government Pension Investment Fund (GPIF) — the largest pension fund in the world with over $1.7 trillion in assets — UN Special Envoy on Innovative Finance and Sustainable Investments, and the most important voice on ESG investing from the perspective of the world's largest institutional asset owners. Throughout 2025-2026, Mizuno's board roles at Tesla and Compuage, his UN advisory work, and his public commentary on how institutional investors can and should use their influence to drive corporate sustainability continued to make him one of the most practically credible voices on sustainable finance — someone who actually deployed ESG criteria at a scale no other individual has matched.

Based in New York City, NY, USA

Founding Director of the NYU Stern Center for Sustainable Business, former President of the Rainforest Alliance, and the most rigorous academic voice on the financial business case for sustainability — her Sustainability ROI research providing some of the most cited empirical evidence that ESG integration improves rather than harms financial performance. Throughout 2025-2026, as the debate on whether ESG investing underperforms conventional investing intensified, Whelan's data-driven research continued to provide the most practically useful evidence for sustainability professionals making the internal business case for ESG investment. An academic whose work directly shifts corporate behaviour.

Based in Exeter, UK

Professor at the University of Exeter Business School, founder of Arctic Basecamp — the science communication initiative that brings Arctic researchers to Davos to brief world leaders on the urgent realities of Arctic ice melt — and one of the most creative and effective science communicators working on climate risk for business audiences. Throughout 2025-2026, Arctic Basecamp's continued presence at the World Economic Forum and Whiteman's research on the financial materiality of Arctic tipping points continued to make her one of the most distinctive and practically important voices connecting climate science with business risk assessment. Her approach — bringing the physical reality of climate change to the rooms where financial decisions are made — is uniquely effective.

Based in Sausalito, California, USA

Environmentalist, entrepreneur, author of The Ecology of Commerce, Natural Capitalism, Blessed Unrest, and editor of Drawdown — the landmark research project that identified and quantified the 100 most substantive solutions to climate change, which remains one of the most practically useful and widely cited sustainability reference works available. Throughout 2025-2026, the Drawdown framework continued to be used by businesses, governments, educators, and investors globally as the most evidence-based catalogue of what actually works in reducing atmospheric carbon. Hawken's career — spanning over five decades of entrepreneurship and environmental advocacy — makes him one of the founding intellectual voices of the modern sustainability movement.

Based in Ventura, California, USA

Founder of Patagonia — and in 2022, the person who gave the entire company away, transferring ownership to a trust and a non-profit to ensure that all profits are used to fight climate change and protect undeveloped land. His declaration that "Earth is now our only shareholder" was one of the most consequential corporate governance statements of the decade. Throughout 2025-2026, Patagonia's continued activism, its legal challenges to environmental rollbacks, and the ongoing global discussion of Chouinard's ownership model as a template for purpose-driven business continued to make him one of the most discussed and admired figures in the sustainability space — the living proof that a genuinely sustainable business model is commercially viable at scale.

Based in San Francisco, California, USA

Sustainability Officer at Netflix, former sustainability strategist at Autodesk, and one of the most practically experienced voices on what corporate sustainability looks like inside large consumer-facing organisations — including the specific challenges of measuring and reducing the carbon footprint of digital infrastructure and content production. Throughout 2025-2026, Stewart's writing, speaking, and public engagement on corporate sustainability implementation continued to make her one of the most practically useful voices for sustainability professionals working inside large companies. Her combination of technology sector credibility, genuine operational experience, and accessible communication style makes her a valuable and underrecognised voice in the sustainability leadership conversation.