Copenhagen: Sixty-five world leaders have confirmed that they will attend a United Nations (UN) conference in Copenhagen in December that will try to clinch a new global climate deal, and many more are considering, Danish officials said on Sunday.

Seeking dialogue: Danish Prime Minister Lars Lokke Rasmussen. Analysts say the decision to invite leaders is a calculated risk. Simon Dawson / Bloomberg

UN said this month that around 40 leaders had indicated plans to attend, mostly from developing nations as well as from Germany and Britain, even before the official invitation. European Commission president Jose Manuel Barroso has said he would come. And US President Barack Obama has said he would attend if it could give impetus to a deal.

Danish Prime Minister Lars Lokke Rasmussen’s decision to invite world leaders is a calculated risk, analysts say. Their presence can raise chances of a deal but the need for a summit is an admission that negotiations are in trouble after a final round of talks in Barcelona this month.

(Anna Ringstrom contributed to this story.)