By political reporter Matthew Doran.
Former Greens leader Christine Milne has paid tribute to her party colleagues in her last speech to the Senate.
Senator Milne announced her resignation as Greens leader last month, and said she would not be recontesting her position at the next federal election.
Party staff have told the ABC she did not want to make an official valedictory speech, and wanted to have a more low-key exit from political life.
Senator Milne told the chamber the strength of the Greens is found at its roots in activism.
"It is a case of striving to seek to find, and not to yield, or as Peter Cundall in Tasmania would say, 'we will never ever give up'," she said.