Climate activists brought traffic to a standstill in Perth's CBD as streets were shut down and police arrested 65 disruptive protesters, including one man dressed as a pirate who glued his feet to a treasure chest.
Major roads, including a freeway exit into the city, St Georges Terrace, and the intersection at the Hay Street Mall and William Street, were closed off on Friday morning.
Talkback callers complained they could not get to work because police and hundreds of Extinction Rebellion activists were blocking them.
At one stage, protesters stopped to do yoga, and power tools were eventually used to cut through pipes and chains that some people used to join their hands.
Among the protesters was former federal MP Scott Ludlam, who was arrested in Sydney earlier this week at a climate protest and said it was worth it.
"I'm willing to put my body on the line," Mr Ludlam said.
The protesters also handed out flyers apologising for the "inconvenience".
"We are in a climate and ecological emergency," the flyer read.
"We need the government to make changes now and they are not listening. Non-violent disruption is the only morally acceptable tool we have left."
Superintendent Omar Chahal told reporters there had been 65 arrests, two people summonsed and one juvenile given a move-on notice.
Charges are expected to include disorderly conduct and obstructing police.
"I actually thought they were very respectful. I would say they were actually very restrained," he said.
"They got their message across that they want to portray to the government about climate change."
Supt Chahal said police used significant resources, which drew them away from other areas, but in his 25 years of experience he had not seen a more seamless police operation.