Unfortunately many scientists see themselves too much as priests whose job it is to preach moralistic sermons to people. This is another legacy of the 1968 generation, which I happen to belong to myself. In fact, it would be better if we just presented the facts and scenarios dispassionately - and then society can decide for itself what it wants to do to influence climate change.

It is in fact necessary to reduce CO2 emissions. There is no reason why we shouldn't spend our vacations on (the North Sea island of) Sylt instead of in the Seychelles, or drive more economical cars - for the sake of preserving increasingly scarce resources if nothing else. But that won't enable us to stop climate change. As long as China, India and the United States continue the way they have been, what we Germans do is more or less irrelevant.

If higher summer temperatures become the norm in the future, people will adjust. Perhaps they'll take naps more frequently in the afternoon and convert their houses accordingly. The good thing is that all of these changes will not happen overnight, but in the space of decades. We still have enough time to react.

Unfortunately, some scientists behave like preachers, delivering sermons to people. What this approach ignores is the fact that there are many threats in our world that must be weighed against one another. If I'm driving my car and find myself speeding toward an obstacle, I can't simple yank the wheel to the side without first checking to see if I'll instead be driving straight into a crowd of people. Climate researchers cannot and should not take this process of weighing different factors out of the hands of politics and society.

Because of the inherent time lag in the climate system, the greenhouse gases that have already been pumped into the atmosphere will undoubtedly lead to a certain increase in temperature in the coming decades.

Nowadays it's those hedonistic wastrels who pollute the air so that they can look at some pretty fish in the South Seas. It would be better if we only ever rode bikes. Oh, there's always someone wagging a finger in disapproval.

If things continue as they have been, in five years, at the latest, we will need to acknowledge that something is fundamentally wrong with our climate models. A 20-year pause in global warming does not occur in a single modeled scenario. But even today, we are finding it very difficult to reconcile actual temperature trends with our expectations.