Thousands gather in ACT for climate march

Thousands of Canberrans have joined a worldwide protest by marching to support action on climate change.

They gathered on the front lawn of parliament house, a broad cross-section of people from Labor and the Greens to the fireman's union, bee keepers, the Grim Reaper and Tibetan cows - pantomime-style cows that is.

"We are unstoppable, another world is possible," was the chant as the march - estimated by organisers to be as many as 6000 people - set off.

Federal Labor ACT MP Gai Brotmann said people were sending a strong message to the Turnbull government.

"Action is required on climate, credible action and direction action is not that," Ms Brotmann told AAP.