21 Influential Environmental Leaders Around the World

Environmental leadership rarely fits one job title. It shows up in a UN corridor, a courtroom, a laboratory, a fishing village and a forest at the same time. The people on this list protect rivers, price carbon, negotiate treaties, run companies and organise their neighbours, and each one has found a genuinely different lever to pull.

What connects them is not a shared style. It is a willingness to stay with hard, slow problems long after the novelty has worn off, and to keep making the case for the natural systems the rest of us depend on. Some lead vast institutions. Others built their organisation from a single kitchen table decision.

This is a starting point for anyone who wants to understand how environmental progress actually gets made in 2026, put together as a recognition of the work rather than a scoreboard of who matters most. Roles change quickly in this field, so check each person's current organisation before using this list for an invitation, a partnership or a research project.

1. Inger Andersen

Under-Secretary-General of the United Nations and Executive Director, United Nations Environment Programme

Inger Andersen runs the part of the UN system built to turn environmental evidence into decisions governments and businesses can act on. Before UNEP, she led the International Union for Conservation of Nature and spent fifteen years at the World Bank, including as Vice President for the Middle East and North Africa.

That mix of finance, development and conservation experience shows up in how she talks about the environment. Andersen treats air quality, biodiversity loss and climate change as connected budget and infrastructure questions rather than separate campaigns, which is part of why governments keep bringing her into the room.

2. Ani Dasgupta

President and Chief Executive Officer, World Resources Institute

Ani Dasgupta trained as an architect before spending nearly two decades at the World Bank working on cities, poverty and post-disaster reconstruction in Indonesia. He carried that ground-level view of infrastructure into the World Resources Institute, where he first built the Ross Center for Sustainable Cities into programmes reaching hundreds of cities worldwide.

As president, Dasgupta pushes WRI to connect climate, nature and human development rather than treating them as competing budgets. His recent book on rebuilding optimism during the climate crisis reflects an approach that stays practical about finance and jobs, not only about targets.

3. Simon Stiell

Executive Secretary, United Nations Framework Convention on Climate Change

Simon Stiell spent five years as Grenada's Minister for Climate Resilience and the Environment before taking the senior UN climate role in 2022, and he was reappointed for a second three year term in mid-2025. His background combines small island climate exposure with an earlier career in the technology industry.

That combination shows in how he frames the negotiations he runs. Stiell regularly reminds wealthier nations that climate finance is not charity for vulnerable countries but a practical investment decision, a framing shaped by having represented one of the states most exposed to sea level rise.

4. Mafalda Duarte

Executive Director, Green Climate Fund

Mafalda Duarte leads the world's largest dedicated multilateral climate fund, a role she took on in August 2023 after running the Climate Investment Funds, where she steered a multibillion dollar portfolio of clean energy and resilience projects across more than seventy developing countries.

Duarte, who grew up in Portugal, has said her focus on climate finance began after witnessing climate impacts firsthand while working in Africa. She now spends much of her time trying to get concessional finance moving faster to the communities that need it most, arguing that slow disbursement is as damaging as insufficient funding.

5. Razan Al Mubarak

President, International Union for Conservation of Nature; Executive Managing Director, Mohamed bin Zayed Species Conservation Fund

Razan Al Mubarak was first elected President of the IUCN in 2021 and re-elected for a second term in October 2025, making her the first person from the Middle East to hold the role. She also leads the Mohamed bin Zayed Species Conservation Fund, which has backed more than three thousand conservation projects around the world.

Her work sits at the meeting point of species protection and climate diplomacy. Al Mubarak previously served as the UN Climate Change High-Level Champion for COP28, and she continues to push for conservation finance to be treated as core climate infrastructure rather than a side project.

6. Christiana Figueres

Founding Partner, Global Optimism

Christiana Figueres led the UN climate negotiations from 2010 to 2016, the period that produced the Paris Agreement, after taking the job when many observers thought a global deal was no longer possible. She now runs Global Optimism, a venture built around the argument that stubborn optimism is itself a climate strategy.

Figueres, from Costa Rica, co-hosts the Outrage and Optimism podcast and continues to advise governments and companies on transition planning. Her consistent message is that despair is a luxury the climate movement cannot afford, because it talks people out of the action that is still available to them.

7. Johan Rockstrom

Director, Potsdam Institute for Climate Impact Research; Professor in Earth System Science, University of Potsdam

Johan Rockstrom helped develop the planetary boundaries framework, which set out to define the environmental limits within which humanity can safely operate. Since 2018 he has directed the Potsdam Institute, one of the world's most cited climate research centres.

Rockstrom's research keeps returning to a single, uncomfortable idea: that several of these planetary boundaries have already been crossed. Rather than treat that as a reason for fatalism, he uses it to argue for faster, more coordinated action on the boundaries that can still be brought back within safe limits.

8. Sunita Narain

Director General, Centre for Science and Environment

Sunita Narain has spent more than four decades building the Centre for Science and Environment into one of the most influential environmental research bodies in the Global South, combining laboratory testing with public advocacy. She also edits the magazine Down To Earth and chaired India's Tiger Task Force.

Narain's central argument, developed over decades of writing and campaigning, is that poorer countries cannot follow the same pollute-first, clean-up-later path that wealthier nations took. Her advocacy helped shift Delhi's public transport towards cleaner fuel, and she continues to push for environmental policy that treats justice and science as inseparable.

9. Hindou Oumarou Ibrahim

Lui-Walton Senior Indigenous Fellow, Conservation International

Hindou Oumarou Ibrahim, a member of the semi-nomadic Mbororo community in Chad, leads the Association for Indigenous Women and Peoples of Chad and has spent over a decade bringing Indigenous knowledge into international climate negotiations. Her work began around Lake Chad, which has lost ninety percent of its surface area in forty years.

Rather than treat traditional knowledge as folklore, Ibrahim has helped build a three dimensional map of her region that blends satellite data with community understanding of the land. She serves on the UN Permanent Forum for Indigenous Issues and argues that climate solutions fail when they leave out the people who already manage the land day to day.

10. Elizabeth Wathuti

Founder and Executive Director, Green Generation Initiative

Elizabeth Wathuti founded the Green Generation Initiative in Kenya after growing up watching the environment around her home village degrade, inspired partly by the work of the late Nobel laureate Wangari Maathai. The organisation has since grown into one of Africa's fastest growing youth-led climate groups.

Wathuti's approach centres on turning care for the environment into organised local action, from tree planting to restoration and youth policy training, rather than leaving it as an abstract concern. Her Green Generation Initiative reports supporting the planting of millions of trees and training thousands of young people across Kenya.

11. Kate Raworth

Co-founder, Doughnut Economics Action Lab; Senior Teaching Fellow, University of Oxford

Kate Raworth created the Doughnut model, a visual framework that asks economies to meet everyone's basic needs without overshooting the planet's ecological limits. Her book explaining the idea has been translated into more than twenty languages and has been discussed everywhere from the UN General Assembly to city planning departments.

Raworth teaches at Oxford's Environmental Change Institute and is also a Professor of Practice at Amsterdam University of Applied Sciences, a city that has formally adopted her framework to guide policy. Her core argument is that growth for its own sake is the wrong goal, and that thriving within limits is the one that actually matters.

12. Katharine Hayhoe

Chief Scientist, The Nature Conservancy

Katharine Hayhoe directs the global scientific strategy for The Nature Conservancy, leading a community of more than a thousand scientists whose work underpins the organisation's conservation programmes. She has also served as lead author on multiple US National Climate Assessments.

Hayhoe is widely known for her ability to explain climate science to audiences who might otherwise tune it out, an approach she has built through her newsletter, a PBS series and a widely read book on finding common ground in divided conversations. Her consistent argument is that talking about climate change, not staying silent about it, is the first step to caring about it.

13. Ayana Elizabeth Johnson

Co-founder, Urban Ocean Lab

Ayana Elizabeth Johnson, a marine biologist by training, co-founded Urban Ocean Lab to help coastal cities turn ocean and climate policy into practical, fundable local action. The organisation works on everything from stormwater planning to federal policy playbooks for the next window of political opportunity.

Johnson also co-edited the bestselling climate anthology All We Can Save and co-hosted the podcast How to Save a Planet. She sits on the board of Patagonia and consistently pushes the climate conversation away from guilt and towards a genuine question: what does it look like to actually get this right.

14. Vanessa Nakate

UNICEF Goodwill Ambassador; Founder, Rise Up Movement

Vanessa Nakate began striking for the climate alone on the streets of Kampala in 2019, inspired by Greta Thunberg, and has since become one of the most recognised voices connecting the climate crisis to its impact on African communities. UNICEF appointed her a Goodwill Ambassador in 2022.

Nakate founded the Rise Up Movement to elevate African climate activists and has also run a project installing solar panels in rural Ugandan schools. Her advocacy consistently returns to one point: the places least responsible for the climate crisis are often the first and hardest hit, and their voices belong at the centre of the response, not the edge of it.

15. Mary Robinson

Member, The Elders; Adjunct Professor for Climate Justice, Trinity College Dublin

Mary Robinson, the first woman President of Ireland, later became UN High Commissioner for Human Rights and then the UN Secretary General's Special Envoy on Climate Change. She chaired The Elders from 2018 until stepping down in 2024, and remains an active member of the group founded by Nelson Mandela.

Robinson's consistent contribution has been to insist that climate change is fundamentally a human rights and justice issue, not only a scientific or economic one. As Adjunct Professor for Climate Justice at Trinity College Dublin, she continues to connect intergenerational fairness and gender equality directly to climate policy.

16. Nemonte Nenquimo

Co-founder, Amazon Frontlines and Ceibo Alliance

Nemonte Nenquimo, the first female president of the Waorani of Pastaza in Ecuador, co-founded both Amazon Frontlines and the Ceibo Alliance to support Indigenous peoples defending their land, culture and rights in the Amazon rainforest. Her leadership helped win a landmark legal case protecting Waorani territory from oil extraction.

Nenquimo's work treats Indigenous guardianship not as a sentimental idea but as the most effective protection the Amazon has, backed by legal strategy, mapping technology and cross-border organising among the Siona, Secoya, Kofan and Waorani peoples. Her consistent message is that defending the forest and defending Indigenous rights are the same fight.

17. Fatih Birol

Executive Director, International Energy Agency

Fatih Birol has led the International Energy Agency since 2015, a period in which he broadened the organisation's mandate well beyond oil to cover electricity, renewables and critical minerals, and expanded its membership to include major emerging economies. He previously spent two decades at the IEA rising from junior analyst to chief economist.

Birol has twice been named to the TIME100 list of the world's most influential people. His flagship World Energy Outlook reports are read closely by governments and investors, and he has consistently used that platform to argue that clean energy transitions are now an economic opportunity as much as an environmental necessity.

18. Tzeporah Berman

International Program Director, Stand.earth; Chair, Fossil Fuel Non-Proliferation Treaty Initiative

Tzeporah Berman has spent more than three decades designing environmental campaigns in Canada and internationally, including helping negotiate the Great Bear Rainforest agreement, one of the largest forest protection deals in history. She now chairs the Fossil Fuel Non-Proliferation Treaty Initiative, which is building international support for a coordinated phase-out of coal, oil and gas.

Berman argues that climate policy has spent decades focused on demand while largely ignoring the supply of fossil fuels itself. Her 2019 Climate Breakthrough Award funded the early strategy work behind the Fossil Fuel Treaty, and she continues to bring governments and civil society together around that supply-side approach.

19. Bill McKibben

Founder, Third Act; Schumann Distinguished Professor in Residence, Middlebury College

Bill McKibben wrote The End of Nature in 1989, one of the first books to bring climate change to a general audience, and later founded 350.org, the first global grassroots climate campaign. In 2021 he launched Third Act, which organises Americans over sixty to work on climate and democracy.

McKibben's consistent argument across three decades of writing is that individual choices matter less than organised collective pressure on institutions, particularly the finance sector. Third Act has grown to more than seventy thousand members, built on his bet that older Americans, with more time, money and voting power, are an underused force in the climate movement.

20. Rachel Kyte

UK Special Representative for Climate; Professor of Practice in Climate Policy, University of Oxford

Rachel Kyte was appointed the UK's Special Representative for Climate in 2024, returning to international climate diplomacy after leading the Fletcher School of Law and Diplomacy at Tufts University and running Sustainable Energy for All as the UN Secretary General's Special Representative.

Kyte's earlier career included senior roles at the World Bank focused on sustainable development and climate finance. In her current role, she works jointly across the UK's foreign affairs and energy departments, arguing that climate diplomacy and clean energy investment now have to be treated as a single strategic project rather than two separate portfolios.

21. Amina J. Mohammed

Deputy Secretary-General of the United Nations; Chair, United Nations Sustainable Development Group

Amina J. Mohammed has served as UN Deputy Secretary-General since 2017, after leading the process that produced the 2030 Agenda for Sustainable Development and the Sustainable Development Goals. Before joining the UN, she was Nigeria's Minister of Environment, where she directed the country's climate action and environmental protection efforts.

Mohammed now chairs the UN Sustainable Development Group, which coordinates development work across the United Nations system in more than one hundred and sixty countries. Her consistent focus has been on treating environmental protection and development as one shared agenda rather than a trade-off between growth and sustainability.

Conclusion

Read together, these twenty-one profiles resist a single tidy lesson, and that is the point. Some of these leaders run enormous institutions with global budgets. Others built their organisation around one community, one river or one legal case, and scaled their influence through the strength of that specific work.

A second theme is patience without passivity. Almost every person here has stayed with the same core problem for a decade or longer, adjusting their tactics as circumstances changed but never treating the underlying task as finished. That kind of persistence is rarely glamorous, and it is exactly what long environmental problems require.

The third theme is that credibility compounds. Each of these leaders built real institutional standing, whether through research, negotiation, legal wins or grassroots organising, before their voice carried the weight it does now. For any leader trying to build lasting influence in a slow-moving field, that is a genuinely useful pattern to study.

About the Author

Jonno White is a keynote speaker, leadership consultant and author who helps leaders build organisations people would move cities to work at. His work is practical rather than motivational, giving leadership teams something they can use on Monday morning, not a feeling that fades by Friday.

Next Read

If you are thinking about how leaders build the trust and clarity that let organisations act on hard, slow problems, read How to Build a Company Culture Employees Will Move Cities to Join for a practical look at what keeps good people committed for years. For a related look at how leadership teams get genuinely aligned rather than politely nodding along, read 11 Proven Ways to Get Your Leadership Team Aligned.

If your leadership team is trying to turn good intentions into consistent behaviour, on environmental questions or anywhere else, email jonno@consultclarity.org. I help leaders build the trust, clarity and alignment that turn a stated priority into something the whole organisation actually does.