Protesters storm Dunedin bank and sing Rick Astley's Never Gonna Give You Up.

Dozens of climate change protesters stormed into a Dunedin bank and sung the Rick Astley classic Never Gonna Give You Up.

Friday's light hearted protest by 350 Aotearoa was in stark contrast to a similar protest a year ago, where people, including the elderly, were stopped from entering the George St ANZ branch.

This time about 30 protesters went into the branch and began singing the 80s song, in a move known as 'Rick-rolling'.

HAMISH McNEILLY/FAIRFAX NZ Police keep watch over protesters outside Dunedin's ANZ on George St on Friday.

"ANZ isn't giving up on fossil fuels and until they do, we're not going to give up on them," Charlie Montague, 350 Dunedin spokeswoman said.

READ MORE: Elderly woman's message for protesters

On Thursday night, the group projected images of the Great Barrier Reef on an ANZ building in South Dunedin, to highlight the connection between the ecosystems damaged by the coal, oil and gas projects the bank funded.

"There are no excuses for not taking strong action to prevent climate change, especially when they are the largest bank in the Pacific," Montague said.

A police presence remained throughout, with no trouble reported.

ANZ has been approached for comment.