About 200 members of the community united on Port Lincoln's foreshore on Friday afternoon to strike for the climate.
The Global Strike 4 Climate took place in hundreds of towns and cities across the country but the Port Lincoln event was one of just three held in regional South Australia.
Tumby Bay Area School year 12 student Georgia Solly, who organised the strike, said she was amazed with the turn out.
Georgia said her interest in climate change was piqued when she was handing out information at the polling booths during an election.
"By taking time off school and working together around the world, we'll show our politicians that people everywhere want climate justice," she said.
"I really hope the politicians see what we're doing, understand where we're coming from and listen to what we're saying."
The strike called on the federal government to commit to no new coal, oil or gas projects, 100 per cent renewable energy generation and exports by 2030 and funding for a transition and job creation for fossil-fuel industry workers and communities.
Kathryn Hardwick-Franco, who helped Georgia organise the strike, said it was wonderful to see so many people supporting a "whole of system change".
She said their hope was that discussion about climate change would become part of normal dialogue.
"We are seeing that down here today, we've got young people here because they're worried about their future and older people because they are worried about the future of their families," she said.