The Anglican Archbishop of Polynesia says some G20 leaders refuse to admit the damaging effects of climate change on Pacific Island states.

Archbishop Winston Halapua made the remarks during a sermon in Brisbane on Sunday.

"Humanity's greed and merciless abuse of the planet Earth, our only common home, is causing immense damage," Archbishop Winston said.

"Climate change is impacting on the sea level rising, and causing unpredictable storms, uncontrollable floods.

"For some of us from the Pacific Island states, the truth is as plain as writing on a wall; our land and livelihood are drowning while others refuse to see."

Archbishop Winston was in Brisbane to represent the 85 million-strong global Anglican Communion as part of the Oceans of Justice campaign, a worldwide movement led by the Anglican Alliance calling on the G20 to discuss climate change.

He was speaking at St Augustine's Anglican Church in the inner northeast suburb of Hamilton.