Diamond’s analysis of the development of New Guinea

In Questioning Collapse Errington and Gewertz take issue with Diamond’s analysis of the development of New Guinea in both of his books. Describe their most important criticisms of Collapse, and then discuss to what extent you think that Diamond’s specific argument about the highlands of New Guinea is weakened as a result of those criticisms. Conclude with whether you think this matters (in favor or against) Diamond’s more general argument in Collapse.