United Nations, July 21 - The world's largest economies have 'clearly ignored' the findings of the Nobel Peace Prize-winning UN scientific body that evaluates climate change when formulating their recent proposals on slashing greenhouse gases, a top official said.

It was a 'big step' for leaders of over one dozen developed nations attending the Major Economies Forum (MEF) to recognise that the global average temperature should not increase by more than two degrees centigrade, Rajendra Pachauri, chair of the UN Intergovernmental Panel on Climate Change (IPCC), told reporters here Monday.

But they have disregarded the IPCC's findings that emissions will have to reach their pinnacle in 2015 and rapidly decline thereafter, he said, referring to the meeting of MEF, including the Group of Eight (G8) nations and others, in L'Aquila, Italy July 9.

'If the G8 leaders agreed on this two degree increase as being the limit that could be accepted, then I think they should have also accepted the attendant requirement of global emissions peaking by 2015,' Pachauri said.