Article published on the 2008-07-08 Latest update 2008-07-08 09:25 TU
"I hope the US ultimately should take all this leadership role. This is what the whole international community expects of the United States," Ban told the French news agency AFP.
Ban also said he would meet on the sidelines with African leaders in a bid to resolve the political crisis in Zimbabwe and that he spoke about climate change with Chinese leaders including President Hu Jintao during a visit last week to Beijing.
"I know that the Chinese and Indians, they are also committed to this process. I was encouraged by what Chinese leaders have told me," Ban said.
The G8 - which consists of Britain, Canada, France, Germany, Italy, Japan, Russia and the United States - is set to meet Wednesday in an extended session with leaders of emerging economies including Hu and Indian Prime Minister Manmohan Singh.
Both major candidates to succeed US President George W. Bush have promised tougher action on climate change. A UN-led conference in Bali in December set a goal of reaching a post-Kyoto deal by the end of 2009.
The last G8 summit in Germany agreed that industrial powers would "consider seriously" at least halving carbon emissions blamed for global warming by 2050.