Supporters gathered at the Watonga Rocks viewing platform for the first of several photographs at Lighthouse Beach, inspired by the People's Climate March, a global event ahead of a UN summit in New York on climate change.

Port Macquarie group facilitator Penn Short said climate change affected us all.

She said the impacts of climate change had already started, citing dune erosion and mature banksias toppling into the sea at Lighthouse Beach.

"We can see it happening in prolonged drought, wilder storms and acidification of the ocean," Ms Short said.

Photographs from the Port Macquarie event appeared on social media and websites.

"Although it is a global mobilisation and global issue, we wanted to give it a local flavour and something most people would identify with," Ms Short said.

She said we had 10 to 15 years to turn things around, and as such we must demand action of our local, state, federal and global leaders.

The group called for governments to reduce carbon emissions and level the playing field for renewable energy.

Events from tree plantings to rallies and photo shoots occurred over the weekend, led by Avaaz, 350.org and GetUp.

They brought together people in support of action to keep global warming below two degrees celsius.

Matt Bell, who spoke at the Port Macquarie event, offered practical advice.

"We want people to be able to take courage from an event like this where it is a collective action, and that gives them a sense there are other people besides themselves with concerns," he said. "They can go out and continue to push the cause of stronger climate action."

Mr Bell suggested people talk about the issue with workmates and friends, think about where they spent their money, join Climate Change Australia or study a free online course through Open2Study.