The week of protests at ports in Newcastle, Brisbane and Melbourne is aimed at drawing attention to the climate and ecological crisis.
The solo activist at the Port of Newcastle, who identified himself as Vickers, said Australia was unwilling to control its addiction to extracting fossil fuels and "flogging them to the rest of the world".
"Australia is massively driving the climate crisis that we're all having to face right now and into the foreseeable future if we don't act now," he said.
"In the absence of any braking system to this runaway train towards global destruction, I am taking matters into my own hands by stopping the world's largest supply chain export of coal from operating.
"We need to disrupt Australia where it hurts most. Ports represent 98% of Australia's trade - where most of its wealth and prestige lies with the rest of the world."
In Melbourne Blockade Australia activist Aiko who is non-binary and prefers the pronoun they, ascended a 9m monopole device on the railway line servicing the Port of Melbourne, the ropes supporting their life stretched across five tracks.
They cut all rail traffic in and out of the Swanson and Appleton Docks, the biggest rail bottleneck inside the largest container port on the continent.
Aiko said: "We need some radical change, we need some radical resistance against the exploitative system".