The Extinction Rebellion protesters were met with a strong police presence as they marched through the city on Thursday calling for more government action on climate change.
The world's wildlife is in rapid retreat almost everywhere,with more than 35,000 species threatened with extinction,or more than a quarter of all animal groups assessed by the International Union for Conservation of Nature.
Extinction Rebellion is promising a mass rally in the Brisbane CBD on Thursday and further smaller pop-up protests after the blocking of a busy intersection on Monday.
Firefighters lifted both men off the top of the truck and brought them to the ground. They were arrested and face serious charges.
A heavy police presence including officers on horses,motorbikes,bicycles and on foot surrounded the crowd of about 200 protestors who marched from Kings Park to the Malcolm Street bridge at the top of St Georges Terrace.
We've opened up our economy and allowed more social freedom,but we haven't restored our democratic rights.
The 29-year-old woman was brought down from her bamboo harness after about three hours of heavy traffic congestion.
An Extinction Rebellion protest outside Perth's Chevron offices saw grandparents superglue themselves to the windows of the gas giant's headquarters.
The council banned Extinction Rebellion from booking library rooms in October last year,saying the group was inciting illegal activity.
Extinction Rebellion said it took the action to highlight what it regards as the Murdoch-owned newspapers failure to accurately report on climate change.
Brisbane Extinction Rebellion members organised a"vigil"outside City Hall detailing the impact of climate change on future generations.