'Seal a deal', climate talks told

The high-level segment at the UN climate summit has opened, with UN chief Ban Ki-moon telling nations to "seal a deal" on climate change.

He told delegates in Copenhagen that they had the chance to change history.
But he added: "We do not have another year to deliberate; nature does not negotiate with us."
Earlier, a senior UN official warned that negotiations were progressing too slowly and that there was still an "enormous amount of work to be done".
"For three years, I have sought to bring world leaders to the table," Mr Ban said. "Three years of effort comes down to three days of action."
He urged the gathered negotiators not to "falter in the home stretch".
"No-one will get everything they want. But if we work together then everyone will get what they need.