UN climate talks in Doha are lurching to a close with key issues unresolved.
There are outstanding disputes on finance, compensation for climate change damages and allocations of carbon permits.
Developing countries see a lack of ambition among richer countries to tackle climate change.
A BBC analayst in Doha says it now looks likely that negotiations would run through Friday night and maybe into Saturday.
Host nation Qatar has been criticized for letting the talks process drift.
The Doha talks represent the hinge point between the Kyoto protocol and a future system to be settled by 2015.