Hopes for the Copenhagen climate summit in December have been boosted after it emerged that more than 60 presidents and prime ministers plan to attend.
The summit is seeking a new global deal on climate change
There had been concern that no strong agreement would emerge from the talks in Copenhagen.
The annual UN climate change talks are usually conducted by countries' environment ministers.
UK Prime Minister Gordon Brown, who will be attending, has said a new deal would be more likely if heads of governments put their own reputations（名聲，名譽） on the line.
Australian Prime Minister Kevin Rudd, who will be a key negotiator at the summit, has said he believes those involved in the summit are capable of reaching an agreement on climate.
"I believe there is a strong and high degree of political resolve from many of the leaders around the world to land a Copenhagen agreement," he told the BBC.
He says every nation will be entering the talks with dirty hands so that should not stand in the way of an agreement.
The leaders of China, the US and India - some of the world's biggest polluters - are so far not on the list to attend the Copenhagen meeting.
The news comes as a row continues over emails between climate scientists which were stolen from a British university computer.
They are demanding a public enquiry（詢問） into the science behind any deal in Copenhagen.
The scientists behind the research say the scientific debate about climate change is sound and have accused the sceptics of trying to undermine Copenhagen.
He told the Associated Press News agency 102 of his emails had been posted on the internet and he felt "violated".
Critics say the e-mails show that scientists have distorted the facts（歪曲事實） of climate change, but Mr Trenberth said the e-mails had been "taken out of context".
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