Parents and students at primary schools across Sydney gathered outside school gates to demand stronger climate action from state and federal governments on Thursday morning.

Their calls echo those of 20,000 people who attended a climate protest in Sydney's CBD on Wednesday night, concerned at the bushfires raging across the state and the smoke that has blanketed the city.

Orange Grove Primary School students and parents demand urgent action on climate change outside the school gates on Thursday morning. Credit:Kate Geraghty

Orange Grove Primary School parent Kobi Shetty, who organised the protest, said: "It’s an opportunity to get out there and make our voices heard."

Ms Shetty addressed the group of about 40 parents and students to say the smoke that had covered the city in recent days was a "constant reminder to all of us that we are facing a climate emergency of proportions that are pretty hard to comprehend".