Paul Bartha

1 Introduction The longstanding failure to achieve an adequate international climate change mitigation treaty and the urgent need to act quickly to stave off severe impacts suggest an obvious need for leadership in the form of unilateral mitigation. By unilateral mitigation we mean mitigation efforts taken in absence of any widespread agreement requiring others to do the same.

De Finetti would claim that we can make sense of a draw in which each positive integer has equal probability of winning. This requires a uniform probability distribution over the natural numbers, violating countable additivity. Countable additivity thus appears not to be a fundamental constraint on subjective probability. It does, however, seem mandated by Dutch Book arguments similar to those that support the other axioms of the probability calculus as compulsory for subjective interpretations.