Tuvalu has issued a stern warning to its Pacific Island neighbours, urging countries not to do deals outside of the like-minded group at major climate talks in Paris.

Tuvalu Prime Minister Enele Sopoaga called for the small island developing states to band together and fight off "serious attempts" to drive a wedge between them.

The call highlights the tensions emerging between even the most tight-knit collections of countries in Paris after days of lengthy and slow negotiations.

The Prime Minister is upset he wasn't invited to a meeting between some Pacific Island nations, including Kiribati, and United States President Barack Obama earlier this week.

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The US offered movement on risk insurance at the meeting as a compromise to finance commitments known as loss and damage.

Mr Sopoaga said he'd heard of deals being made outside the negotiations.

"There are serious efforts to want to drive a wedge to divide us," he said.

"This is dangerous and we must not allow that."

Loss and damage is a major sticking point at the UN conference, with vulnerable countries pledging to dig their feet in and demand funding to repair their nations.

Australia is part of a developed nation commitment to raise climate finance to $100 billion each year by 2030 - from private and public sources.

But large developed nations don't want anything in a Paris agreement that would admit liability for compensation due to climate change.

Cook Islands Prime Minister Henry Puna said it was "no exaggeration to say this is a matter of life or death for us".

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As the richest country in the region, Australia has faced calls to go in to bat for its Pacific neighbours.

Its negotiators are understood to be "strongly supporting" a vulnerable nation push to mention a goal of limiting global warming to 1.5C.