Police officers block demonstrators attempting to march on the convention hall where world leaders gathered to try to reach a deal on tackling climate change
World leaders gathered at the Copenhagen climate conference on Wednesday as police clashed with demonstrators amid mounting tensions ahead of Friday's deadline for reaching a deal.
United Nations officials voiced hope that the influx of more than 110 heads of government would break the deadlock between rich and poor countries over how the burden of fighting global warming should be shared.
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