Figure 2.

Alternative algorithms for estimating global variation in the suitability of local climates for the first 105 species domesticated by humans (a and b) and their effect on farming propensity (c and d). (a) Number of domesticated species expected to be available at each site given ecological conditions and a dispersal limit from corresponding centres of origin of 8,000 km. (b) Predicted number of early domesticates without any dispersal constraints. (c) Effect of (a) on the farming propensity of early 20th century traditional societies. (d) Effect of (b) on the farming propensity of early 20th century traditional societies.