Vandana Shiva is an Indian environmental activist, author, and ecofeminist who is widely recognized as the 'Mother of Environmentalism'. She played a significant role in the Chipko movement, which aimed to protect trees from felling in the Himalayan region.

Wangari Maathai, a Kenyan environmental activist and Nobel Peace Prize laureate, is known for her 'Hug the Trees' movement. She mobilized women to plant trees and protect forests in Kenya, leading to the establishment of the Green Belt Movement.

Paul Watson is the founder of the Sea Shepherd Conservation Society, an international non-profit organization dedicated to protecting marine wildlife. The organization is known for its direct action campaigns against whaling, seal hunting, and other forms of marine exploitation.

Julia Butterfly Hill is an American environmental activist who gained fame for her tree-sitting protests in California. She spent 738 days living in a 1,500-year-old redwood tree, known as Luna, to prevent its felling.

Ken Saro-Wiwa was a Nigerian environmental activist and writer who founded the Movement for the Survival of the Ogoni People (MOSOP). MOSOP advocated for environmental justice and the rights of the Ogoni people, who were affected by oil pollution and environmental degradation in the Niger Delta region.

Chico Mendes was a Brazilian environmental activist and trade union leader who fought to protect the Amazon rainforest. He was assassinated in 1988 for his efforts to organize rubber tappers and indigenous communities against the destruction of the rainforest.

David McTaggart was a Canadian environmental activist and co-founder of the Greenpeace organization. He played a key role in the early campaigns of Greenpeace, which focused on raising awareness about environmental issues and advocating for change.

Medha Patkar is an Indian social activist and environmentalist who is known for her work to protect the Narmada River and for her opposition to the construction of large dams. She has been involved in the Narmada Bachao Andolan (Save the Narmada Movement) since its inception in 1985.

Dave Foreman is an American environmental activist and co-founder of the Earth First! movement. Earth First! is a radical environmental organization that advocates for direct action to protect the environment, including tree-sitting, civil disobedience, and sabotage.

Bob Brown is an Australian environmental activist and politician who is known for his work to protect the Great Barrier Reef and for his opposition to coal mining. He was a co-founder of the Australian Greens political party and served as a senator for Tasmania from 1996 to 2012.

Winona LaDuke is an American environmental activist and writer who is known for her work to protect indigenous rights and the environment. She is the founder and executive director of the Indigenous Environmental Network, which works to address environmental issues affecting indigenous communities.

Greta Thunberg is a Swedish environmental activist who is known for her work to protect the Arctic National Wildlife Refuge and for her opposition to oil drilling in the Arctic. She gained international attention in 2018 for her "Fridays for Future" school strikes, which inspired millions of young people around the world to take action on climate change.

Roger Hallam is a British environmental activist and co-founder of the Extinction Rebellion movement. Extinction Rebellion is a global environmental movement that uses nonviolent civil disobedience to raise awareness about the climate crisis and to demand action from governments and corporations.

Tzeporah Berman is a Canadian environmental activist and writer who is known for her work to protect the Salish Sea and for her opposition to the Trans Mountain pipeline. She is the co-founder and executive director of the Sierra Club BC, a leading environmental organization in British Columbia.

Carla Reemtsma is a German environmental activist and co-founder of the Last Generation movement. Last Generation is a global environmental movement that uses civil disobedience to demand immediate action on climate change, such as blocking roads and disrupting infrastructure.