Resources Minister Shane Jones shut down the possibility of New Zealand signing up to a 'road map' away from fossil fuels at the annual global climate summit, documents reveal.

Opposition MPs say the documents underscore the disproportionate influence that National's minor coalition partners wield over government policy.

But Climate Change Minister Simon Watts said it was "appropriate" to consult Jones because of his portfolios.

Australia, the UK, the European Union and a group of Pacific nations were among 80 countries pushing for a 'road map' to be included in the formal negotiations at COP30 in Brazil last November.

They were unsuccessful, but Australia and several Pacific nations were among 24 nations that signed the Belém Declaration on the Transition away from Fossil Fuels on the final day of the summit.

Documents released to RNZ under the Official Information Act show New Zealand's negotiating team was also considering signing the declaration - before officials back in New Zealand informed them that Jones did not want them to.