Accusations flew at deadlocked UN climate talks in Lima on Saturday, as the United States warned that failure to compromise could doom the 22-year-old global forum.
Running deep into an unscheduled 13th day, the negotiations got mired in a row between rich and poor countries over sharing out responsibility for cutting climate-altering greenhouse gases.
Nearly a full day after the scheduled close of the meeting, the chairs of a working group tasked with formulating a text presented negotiators with a proposed compromise.
Many rich nations accepted it as a workable blueprint.
But developing countries kicked it out, saying the document failed to balance action on tackling carbon emissions with help for vulnerable economies.