The Alliance of Small Island States has described extended measures to combat climate change as deeply deficient.
Nauru's Foreign Minister Kieran Keke who delivered the group's closing statement at the end of talks in Doha says the deal is likely to lock in a global temperature rise of up to five degrees.
The agreement reached at the UN talks in Qatar extended until 2020 the emissions-limiting Kyoto Protocol but without key nations like Japan, Canada and Russia.
The Alliance also criticised the deal for providing no new finance, only promises, and it says it is difficult to see how the process can continue.
The group took a swipe at developed nations saying those who are obstructive and self serving need to realize it is not about the impact on their people's comfort but about the very survival of the people of small island states.
The group is looking to the climate change leaders summit in 2014 to deliver concrete outcomes.