Svante Arrhenius, a Swedish scientist, conducted groundbreaking research on the greenhouse effect in the late 19th century, earning him the title "Father of Climate Change".

Greta Thunberg, a young Swedish activist, has gained global recognition for her passionate speeches at UN Climate Change Conferences, urging world leaders to take decisive action to address the climate crisis.

James Hansen, an American climate scientist, is widely recognized for his groundbreaking research on global warming and his influential testimony before the US Congress in 1988, which brought widespread attention to the issue of climate change.

Wangari Maathai, a Kenyan environmental activist and Nobel Peace Prize laureate, founded the Green Belt Movement, which has played a crucial role in reforestation efforts and empowering women in rural communities.

Rachel Carson, an American marine biologist and conservationist, wrote the influential book "Silent Spring" in 1962, which exposed the dangers of pesticides and their impact on the environment, leading to the ban of DDT and the rise of the modern environmental movement.

Al Gore, a former Vice President of the United States, is a prominent climate activist and environmentalist. His documentary film "An Inconvenient Truth" played a significant role in raising public awareness about climate change and its consequences.

Vandana Shiva, an Indian environmental activist and author, has dedicated her life to promoting sustainable development, protecting biodiversity, and advocating for the rights of indigenous communities.

Raoni Metuktire, an indigenous leader from the Kayapo people of Brazil, has been a tireless advocate for the protection of the Amazon rainforest and the rights of indigenous peoples.

Randy Hayes, an American environmental activist, founded the Rainforest Action Network in 1985. He has been instrumental in raising awareness about the importance of rainforests and advocating for sustainable forestry practices.

Mohamed Nasheed, the former President of the Maldives, has been a vocal advocate for climate action and has played a crucial role in raising awareness about the vulnerability of low-lying island nations to the impacts of climate change.

Greta Thunberg, a Swedish environmental activist, founded the Fridays for Future movement in 2018. The movement has mobilized millions of young people around the world to demand urgent action on climate change.

Bill McKibben, an American environmental activist and author, is a leading voice on climate justice and has been a vocal advocate for the rights of vulnerable communities disproportionately affected by climate change.

John Muir, a Scottish-American naturalist and conservationist, founded the Sierra Club in 1892. The organization has played a crucial role in protecting wilderness areas and advocating for environmental conservation.

Oscar Arias Sánchez, a former President of Costa Rica, was awarded the Nobel Peace Prize in 1987 for his efforts in promoting peace and sustainable development in Central America.

Lois Gibbs, an American environmental activist, is a pioneer in the field of environmental justice and has been a tireless advocate for the rights of communities affected by pollution and environmental degradation.