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Gaylord Nelson
Born
Before there were Green parties, the Wisconsin Democrat showed how environmental ideas could work inside an existing one. As governor he funded land purchases for parks with a one-cent tax on cigarettes; as a US senator he proposed the first Earth Day in 1970, whose 20 million participants helped push Congress to pass the Clean Air Act amendments, the Clean Water Act and the Endangered Species Act within three years.
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Petra Kelly
Born
Kelly co-founded Die Grünen in 1980 and led them into the Bundestag in 1983, the first Green breakthrough in a major national parliament. She called it an "anti-party party": ecology, non-violence, grassroots democracy and social justice, with MPs rotating out mid-term to avoid careerism. She refused to rotate herself, opposed coalitions with the Social Democrats and lost the argument to the "realos"; her history is the clearest way into the movement's founding dilemma.
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Bob Brown
Born
Brown led the blockade of the Franklin River dam in Tasmania, entered the state parliament the day after his release from prison in 1983, and saw the dam stopped when the new Hawke government used federal powers, upheld by the High Court. He went on to found the Australian Greens in 1992 and lead them in the Senate, where minority Labor governments needed Green votes, most notably for the carbon price passed in 2011.
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Joschka Fischer
Born
Fischer was sworn in as Hesse's environment minister in 1985 wearing trainers, the first Green to hold ministerial office in Germany, and he became the leading "realo" arguing that Greens should govern. As federal foreign minister from 1998 he backed NATO's 1999 Kosovo intervention, and was hit by a paint bomb at a party conference for it. His career shows both what office delivered and what pacifist members felt it cost.
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Pekka Haavisto
Born
When Haavisto became Finland's environment minister in 1995, he was the first Green to sit in a European national cabinet. He later ran the UN Environment Programme's post-conflict assessments, which measured environmental damage from wars in the Balkans and Afghanistan, and as foreign minister from 2019 he handled Finland's NATO application, a striking role for a Green. He was runner-up in Finland's 2024 presidential election.
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Dominique Voynet
Born
Voynet negotiated the Greens' place in Lionel Jospin's "plural left" coalition and served as environment and regional planning minister from 1997 to 2001. She secured the decision to close the Superphénix fast-breeder reactor and wrote a planning law requiring regions to plan for sustainable development, but had to accept continued nuclear power and road building. Her experience is the French case study in what a junior coalition partner can and cannot win.
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Jürgen Trittin
Born
As Germany's federal environment minister from 1998 to 2005, Trittin negotiated the 2000 agreement with the power companies to phase out nuclear power, introduced a deposit on drinks cans that business fought for years, and steered the eco-tax on energy. The nuclear deal was attacked from both sides: as too slow by anti-nuclear activists and as an attack on industry by the opposition, which reversed it in 2010 before Fukushima reversed the reversal.
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Hermann Scheer
Born
A Social Democrat rather than a Green, Scheer earns his place because he wrote one of the most copied green laws anywhere. With Green MPs he drafted Germany's Renewable Energy Sources Act of 2000, which guaranteed fixed prices for solar and wind power fed into the grid; feed-in tariffs spread to dozens of countries and drove down solar costs. Critics point to the surcharge on household bills. He also campaigned for the agency that became IRENA.
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Jeanette Fitzsimons
Born
Fitzsimons co-led New Zealand's Greens from 1995 to 2009 and showed how a small party can legislate from outside government. Her member's bill became the Energy Efficiency and Conservation Act 2000, creating a national efficiency agency, and in 2009 the Greens signed a deal with John Key's National government that funded a large home insulation programme. Some members thought dealing with the centre-right was a mistake; the insulated houses are the counter-argument.
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Wangarĩ Maathai
Born
Maathai's Green Belt Movement paid rural Kenyan women to plant trees, tens of millions of them, linking soil, firewood and water to women's livelihoods and, eventually, to democracy, since protecting forests meant confronting the Moi government over land grabs. After years of arrests she won a parliamentary seat in 2002 and became assistant environment minister, and in 2004 she was the first African woman awarded the Nobel Peace Prize. She also founded Kenya's Mazingira Green Party.
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Daniel Cohn-Bendit
Born
The 1968 student leader turned into the Greens' most effective European parliamentarian. In Frankfurt he ran the city's new office for multicultural affairs from 1989; in the European Parliament, where he sat for France and Germany in turn from 1994 to 2014, he co-chaired the Greens/European Free Alliance group and built Europe Écologie, whose 2009 list won over 16 per cent in France. He pushed Greens towards pro-European federalism, which Eurosceptic ecologists resisted.
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Marina Silva
Born
The daughter of Amazon rubber tappers, Silva twice ran Brazil's environment ministry under Lula. From 2004 her action plan against Amazon deforestation combined satellite monitoring, new protected areas and enforcement across ministries, and clearing fell by more than half within a few years; her second spell from 2023 brought it down sharply again. She quit in 2008 after clashes with development-minded colleagues, and again in March 2026 to run unsuccessfully for the Senate.
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Caroline Lucas
Born
Under first-past-the-post, Lucas's 2010 win in Brighton Pavilion gave the Green Party of England and Wales its first MP after decades of trying, built on years as an MEP and patient local organising. With one vote she worked through cross-party alliances, early day motions and select committee work on climate and environmental audit, and co-wrote the Green New Deal report of 2008 that gave the phrase its modern meaning. She stood down in 2024 and the party held the seat.
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Elizabeth May
Born
May worked inside government long before she led a party: as senior policy adviser to a Progressive Conservative environment minister in the 1980s she helped secure the national park reserve on South Moresby in Haida Gwaii. Elected in 2011 as Canada's first Green MP, she got a private member's bill on a national Lyme disease framework passed into law in 2014, a rare feat for a one-member party. She has said she will hand over the leadership, with a successor due to be chosen in November 2026.
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Winfried Kretschmann
Born
A Catholic former teacher, Kretschmann became the first Green head of a German state in 2011, in car-making Baden-Württemberg, and governed for fifteen years, latterly in coalition with the conservative CDU. He courted Daimler and Bosch rather than fighting them, which made him popular with voters and exasperating to the party's left. When he retired in 2026, his fellow Green Cem Özdemir narrowly held the premiership, a sign that his centrist model outlasted him.
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Alexander Van der Bellen
Born
An economics professor who led Austria's Greens from 1997 to 2008, Van der Bellen became the first Green-backed head of state in the European Union when he won the 2016 presidential election, after a re-run forced by irregularities, against the Freedom Party's Norbert Hofer. In office he has stood above party: after the 2019 Ibiza scandal he installed Austria's first non-partisan caretaker government, led by Brigitte Bierlein, and he was re-elected in 2022.
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Eamon Ryan
Born
Ryan served in both of Ireland's Green coalitions, and each ended in electoral disaster, which makes him the sharpest test of whether governing pays. As climate minister from 2020 he passed the Climate Action and Low Carbon Development (Amendment) Act 2021, writing a 51 per cent emissions cut by 2030 and binding five-year carbon budgets into law. In 2024 the Greens lost all but one of their twelve Dáil seats; the act remains in force.
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Patrick Harvie
Born
Harvie co-led the Scottish Greens for seventeen years and took them into government for the first time anywhere in the UK through the 2021 Bute House Agreement with the SNP. As minister for zero carbon buildings, active travel and tenants' rights he brought in the emergency rent freeze of 2022 and work on heat in buildings. The deal's collapse in April 2024 brought down Humza Yousaf, and critics in both parties still argue over whether it achieved enough to justify its costs.
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Robert Habeck
Born
Habeck was Germany's economy and climate minister and vice-chancellor from 2021 to 2025, and the energy crisis after Russia's invasion of Ukraine forced him into choices no Green had planned for: buying liquefied gas from Qatar, building LNG terminals at speed and briefly restarting coal plants, while sharply accelerating wind and solar approvals. His heating law requiring renewable heat in new systems turned public opinion against him. He left the Bundestag in 2025 for academic posts abroad.
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Annalena Baerbock
Born
Baerbock, Germany's first woman foreign minister from 2021 to 2025, pushed the Greens' foreign policy far from its pacifist roots: she backed weapons deliveries to Ukraine, argued for a "feminist foreign policy" with guidelines for the ministry, and made climate a formal strand of German diplomacy with a dedicated envoy. Critics found her rhetoric undiplomatic or her approach to China too hawkish. She was elected to preside over the UN General Assembly's 80th session, from September 2025.
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