Host nation the Marshall Islands wants the Pacific Islands Forum (PIF), which opens in the capital Majuro on Tuesday, to kickstart stalled international efforts to tackle global warming and rising seas.
"We want this to be the Pacific Islands Forum where the region says 'enough's enough'," said Marshall Islands Minister Assisting the President Tony deBrum.
"The Pacific Rim is the source of more than 60 per cent of the world's emissions and rising, so this is the key battlefield in the war against climate change. It's time for us to unleash a new wave of climate leadership."
It includes the atoll nations of Tuvalu, Kiribati and the Marshalls, where most islands are less than a metre (three feet) above sea level and leaders say climate change is an immediate threat to their people, not an abstract scientific debate.
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"Recently waves inundated (our international) airport (and we see) accelerated erosion in most parts of the island," Marshall Islands Foreign Minister Phillip Muller said, adding that changing conditions meant parts of the country were still in the grip of a record-breaking drought.
"We're hoping that we won't have to relocate. That's a choice that we don't want to make," he said.
"We want to work as hard as we can to see if there's a possibility of having our islands continue to exist, that's why we're calling for urgent action from our friends around the world."
Muller said the PIF nations intend to agree on a 'Majuro Declaration' at the summit, which involves taking concrete action on climate change.