Fears that US President-elect Donald Trump will pull out of the 2015 Paris Agreement to limit global warming have pushed almost 200 nations at climate talks in Morocco to declare the deal an "urgent duty".
Trump has called man-made global warming a hoax and said he will withdraw from the Paris Agreement, which seeks to cut net greenhouse gas emissions to zero this century.
In a statement, the ministers at the meeting on Thursday said momentum away from using fossil fuels towards cleaner energy was "irreversible".
"We call for the highest political commitment to combat climate change, as a matter of urgent priority," they said in the Marrakesh Action Proclamation agreed at the meeting.
"Our climate is warming at an alarming and unprecedented rate and we have an urgent duty to respond," it said.
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Delegates applauded, joined hands above their heads in standing ovation after the proclamation was read out.
In the document, rich nations reaffirmed a goal of mobilising $US100 billion ($A135 billion) in climate finance, from both public and private sources, by 2020 to help developing countries.
