BELEM, Brazil — Several nations held firm Friday in blocking proposals in the final stages of this year's U.N. climate talks because they failed to explicitly cite the burning of fuels such as oil, gas and coal as causes of global warming, and the talks appeared certain to sprawl past a midnight deadline.

Juan Carlos Monterrey Gomez, a top negotiator for Panama, said the decadeslong United Nations process risks “becoming a clown show” for the omission. His nation was among 36 to object to a proposal from the conference president, André Corrêa do Lago of host Brazil, because it doesn't provide an explicit guide map for the world to transition away from fossil fuels, nor to strengthen climate-fighting plans submitted earlier this year.

Before nations moved into high-level negotiations behi

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