"They understand it's bad. They don't want it and they want their politicians to act," he told AAP.
Mr Buckingham has criticised Premier Barry O'Farrell for not knocking back the expansion, saying the community wants the exploration licence cancelled across Sydney.
He says the issue will be a principal focus for the Greens in the lead up to the federal election.
"We will raise the issue in state and federal parliaments, demanding that Labor and the coalition put their position on the record, if they're for CSG or against it."