Extinction Rebellion climate activists have staged a protest on the steps of the Sydney Opera House.
Protesters, some clad in red robes with their faces painted white, formed a choir and sang as tourists looked on.
Katoomba resident Nigel Glassey says about 50 people travelled to the protest from the Blue Mountains, where nearby bushfires have been raging for weeks.
"Out in the mountains we've been copping a lot of smoke and ash from the bushfires," he told AAP.
"The fires just keep getting closer and closer. The least we can do is come here and raise our voices and get involved."
Australian Associated Press