The key today, is understanding how big is the look of wisdom we can afford. We have many problems to solve right now! Wars, global warming, global demography, poorness, energy... How much future a leader can consider before becoming unpopular? Fifteen years? Twenty? Consider this sentence: "We put up a new tax: we spend your money to research a new way of producing clean energy; the first plant, will be available in 20 years or more." Count how many people could agree with this.