 Although both 1 and 2 are broadly causal claims, some think that they are not claims about the same kind of causal relation. These causal relations may be differentiated by their relata. Claim 1 relates tokens. It talks about a particular drought and famine, not droughts and famines in general. On the other hand, claim 2 relates types—it is not talking about any particular instance of drowsy driving, but rather drowsy driving in general. A prominent view is that there are different kinds of causal relation corresponding to these different kinds of relata. (See, for instance, Sober 1985 and Eells 1991.)