People don't talk to each other. You're alone with your television set or internet. But you can't have a functioning democracy without what sociologists call "secondary organizations," places where people can get together, plan, talk and develop ideas. You don't do it alone.

There was great anxiety about Russian intervention in the recent German elections, perhaps contributing to the frightening surge of support for the right-wing nationalist, if not neo-fascist, "Alternative for Germany".

Africa's a wreck and it's not because it was hit by an asteroid. It's a wreck largely because it was hit by Europe.

As for geoengineering, there have been serious general critiques that I think cannot be ignored, like Clive Hamilton's, along with many positive assessments. It is not a matter for subjective judgment based on guesswork and intuition. Rather, these are matters that have to be considered seriously, relying on the best scientific understanding available, without abandoning sensible precautionary principles.

Why not stakeholder action? There's no economic principal that says that management should be responsive to shareholders, in fact you can read in texts of business economics that they could just as well have a system in which the management is responsible to stakeholders.

Let's imagine again an observer looking at us without any preconceptions. I think he would be struck by the fact that although human beings have the capacity to develop scientific knowledge, it must be a very limited capacity because it is only done in very narrow and specific domains.

One measure for promoting both stability and fairness across financial market segments is a small sales tax on all financial transactions.