Climate activists have launched national action for a second day, with the public warned to brace for rolling protests nationwide.

Traffic in Brisbane has been thrown into chaos as Blockade Australia also launched a simultaneous protest in Melbourne, blocking Webb Dock Road in front of the Port of Melbourne gates.

Queensland Police were alerted to a man who suspended himself over Port of Brisbane Rd after Pritchard Street about 6.20am, blocking all eastbound lanes.

The male protester has refused orders to lower himself, and  thousands of motorists are stranded as traffic grinds to a halt.

It is the second consecutive day of protests after activists targeted ports in Newcastle, Brisbane and Melbourne on the anniversary of a high-profile raid, resulting in multiple arrests.

Three people have been charged over their involvement in the Monday protests, which were also live-streamed to social media.

Monday’s port protests were held on the same date that a rural property in Colo, northwest of Sydney, was raided last year.

Governments in Victoria, NSW, Tasmania and South Australia have recently moved to clamp down on climate protesters, passing legislation to steeply increase jail time and fines for disrupting major roads and facilities.

– AAP