I think the best and perhaps only sensible policy for the future is to prepare society for change and be prepared to adjust. In 25 years, we'll have a world with some 9 to 10 billion people that will require twice as much primary energy as today. We must embrace new science and technology in a more positive way than we presently do in Europe. This includes, for example, nuclear energy and genetic food production to provide the world what it urgently needs.
It is important to allow a broad debate on energy and climate. We must urgently explore realistic ways to address the different scientific, technical and economic challenges in solving the world's energy problems and the associated environmental issues.
Throughout my life, I have been fascinated by predictability and frustrated by our inability to predict. I don't believe it makes sense for our generation to believe or pretend that we can solve the problems of the future because do not understand what these problems will be. Just do this thought experiment: Imagine you're in month of May 1914, and try to work out a plan of action for the next 100 years! Hardly anything will make sense.
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.
