dismay at the linguists' diatribes against Greenberg._
Cavalli-Sforza's confidence in Greenberg's approach stemmed from the fact that, at least in general outline, he had confirmed it by an independent approach. Before methods of DNA analysis became available, Cavalli-Sforza and colleagues had worked out a genetic family tree of the world's populations in terms of protein differences. Comparing this tree to Greenberg's list of major language families, Cavalli-Sforza showed that peoples who were grouped together on his world population tree tended to fall into the same language family, as 278
defined by Greenberg. Further analysis proved that the correspondence between the world's human population tree and
Greenberg's language families was statistically significant.279
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