Climate Change Debate: A Famous Scientist Becomes a Skeptic
...SPIEGEL ONLINE: But weren't you one of the alarmists 20 years ago? Do you think your position at that time was wrong?

Bengtsson: I have not changed my view on a fundamental level. I have never seen myself as an alarmist but rather as a scientist with a critical viewpoint, and in that sense I have always been a skeptic. I have devoted most of my career to developing models for predicting the weather, and in doing so I have learned the importance of validating forecasts against observed weather. As a result, that's an approach I strongly favor for "climate predictions." It's essential to validate model results, especially when dealing with complex systems such as the climate. It's essential do so properly if such predictions are to be considered credible.

SPIEGEL ONLINE: You think there's a need for climate research to do some catching up in this regard?

Bengtsson: It is frustrating that climate science is not able to validate their simulations correctly. Since the end of the 20th century, the warming of the Earth has been much weaker than what climate models show.

SPIEGEL ONLINE: But the IPCC report discusses these problems in detail.

Bengtsson: Yes, the scientific report does this but, at least in my view, not critically enough. It does not bring up the large difference between observational results and model simulations. I have full respect for the scientific work behind the IPCC reports but I do not appreciate the need for consensus. It is important, and I will say essential, that society and the political community is also made aware of areas where consensus does not exist. To aim for a simplistic course of action in an area that is as complex and as incompletely understood as the climate system does not make sense at all in my opinion....

Study suggesting global warming is exaggerated was rejected for publication in respected journal because it was 'less than helpful' to the climate cause, claims professor
A scientific study which suggests global warming has been exaggerated was rejected by a respected journal because it might fuel climate scepticism, it was claimed last night.

The alarming intervention, which raises fears of ‘McCarthyist’ pressure for environmental scientists to conform, came after a reviewer said the research was ‘less than helpful’ to the climate cause.

Professor Lennart Bengtsson, a research fellow at the University of Reading and one of five authors of the study, said he suspected that intolerance of dissenting views on climate science was preventing his paper from being published.

‘The problem we now have in the climate community is that some scientists are mixing up their scientific role with that of a climate activist,’ he told the Times....