Figure 2: Boxplot of information-theoretic evidence ratios (ERs) comparing two regression models.

Models are fitted on variation in the climate proxy against the number of extinct genera (estimated from model agreement outputs) from 120 to 35 kyr ago, as a function of temporal lag between climate variation and time of extinction. The first regression model assumes a linear relationship between climate variation and the number of extinct genera, whereas the second model assumes no such relationship (that is, no climate effects on megafauna extinction). An ER of >> 3 would indicate support for the slope (climate effect) model²⁷; thus, the observed ratios of ≤1.2 provide no evidence of a climatic influence on extinction.