Robert Nozick has suggested that risky actions are a problem for a moral view based on rights. We ordinarily think that some actions are too dangerous to be permissible, taking into account both the harm risked and the degree of the risk. Other actions, although they run some risk of serious harm, are thought permissible. The problem is to draw this distinction in a principled way by looking to rights.I think that Nozick's argument about risk can be answered but a (...) different argument has convinced me that the rights view cannot handle risk in a satisfactory way. The inability is a function of the basic nature of the view. (shrink)

This article is an attempt at a systematic account of decision making under greater uncertainty than what traditional, mathematically oriented decision theory can cope with. Four components of great uncertainty are distinguished: (1) the identity of the options is not well determined (uncertainty of demarcation) ; (2) the consequences of at least some option are unknown (uncertainty of consequences); (3) it is not clear whether information obtained from others, such as experts, can be relied on (uncertainty of reliance); and (4) (...) the values relevant for the decision are not determined with sufficient precision (uncertainty of values). Some possible strategy types are proposed for each of these components. Decisions related to environmental issues are used to illustrate the proposals. (shrink)