Hundreds of protesters are marching towards the UN climate summit venue in Copenhagen as ministers begin their discussions there.
Activists have been angered by the lack of progress on a new climate deal, and with logistical problems at the summit.
Talks are deadlocked over emission cuts and financial aid for poorer countries.
And as environment ministers and their aides join the talks, the Danish authorities have slashed the number of campaigners allowed into the venue.
Meanwhile, UN Secretary-General Ban Ki-moon has suggested that poor countries may have to give up their hope of getting immediate long-term financial commitments from richer countries.
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