The diplomatic spat has underscored the difficulty of reaching a consensus at the 196-nation talks.
"If we do not respect decisions that we have made, then how can we build trust among the parties?" said Chen Zhihua, China's senior negotiator, referring to long-standing pledges by rich nations to enhance financial support and "revisit" targets for curbing greenhouse gas emissions before 2020.
"And how can we lay a good foundation for the implementation of the Paris Agreement?" he added at a press conference, flanked by diplomats from India, Iran, Nicaragua and Ecuador.
With one degree of warming so far, the planet has already seen an increase in drought, deadly heatwaves and superstorms.
The pact rests on voluntary carbon-cutting pledges from virtually every country in the world.
"The science is clear: if we don't get our act together before 2020, you can forget about the 2 C and 1.5 C targets," said Paul Oquist, Nicaragua's chief negotiator at the talks.
"There has been a failure to comply with existing commitments," he added.
China is the world's top carbon polluter, followed by the United States, the European Union, India and Russia.
Developing countries sought to have a "pre-2020 agenda" formally added to the negotiating process, but the move was shelved at the start of the 12-day talks. Efforts to resolve the issue have so far been fruitless.
"It would be a bad thing if this hangs over into the second week and becomes a political issue for ministers," said Alden Meyer, director of strategy and policy for the Union of Concerned Scientists in Washington DC.
Some 20 heads of state, including French President Emmanuel Macron and German Chancellor Angela Merkel, are scheduled to appear at the UN climate forum next week.
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