Australia's "constructive" role at the United Nations climate change talks in Poland was undermined by its continued support for fossil fuels at home, experts say.

The two week-long summit ended in the city of Katowice on Sunday with an agreement on a so-called rulebook to increase transparency of national emissions-reduction pledges made three years earlier at the Paris Conference of the Parties (COP21).

Delegates to the UN's COP24 climate summit in Katowice, Poland. Credit:AP

But negotiators from nearly 200 countries deferred other decisions, including how to raise aid for developing nations and standard accounting rules for carbon credits, until next year's conference in Chile or possibly later.

The guidelines set out how those countries will report and monitor national emissions pledges. Nations will also be under pressure to lift their goals by 2020 as current targets fall far short of the Paris agreement to keep global warming to well below 2 degrees.