Nicholas Stern, chair of the Grantham Research Institute on Climate Change and the Environment at the London School of Economics Photo: AP
Speaking after the posting online of stolen emails between climate scientists which sceptics claimed showed researchers manipulating the data to back up their theory, Lord Stern said evidence of climate change was ''overwhelming''.
While he said it was important for all views to be heard, he said the degree of scepticism among ''real scientists'' was very small.
Climate science had a strong basis stretching back 200 years, while evidence for global warming came from a number of sources including ice cores which went back as far as 800,000 years into the past, he said.
''This is evidence that is overwhelming, from all sources, that's the kind of climate science we're talking about,'' he said.
''I think it is very important that those with any kind of views on the science or economics have their say - that does not mean that unscientific muddle also has the right to be recognised as searing insight.''
He added: ''If they are muddled and confused, they do not have the right to be described as anything other than muddled and confused.''
Lord Stern was speaking at the launch of studies looking at whether the UN climate talks starting next week in Copenhagen could deliver a deal which would keep temperature rises below the 2C increase that could lead to ''dangerous'' global warming.
The emails and other material were taken from servers at the University of East Anglia's Climate Research Unit before being published on websites run by climate change sceptics, possibly in a bid to undermine the global summit in Denmark.