Figure 4: First and second dimensions produced by our application of nonmetric multidimensional scaling (NMDS) using eco-climatological variables holding established associations with wildfire ignition or spread. Figure includes both the a) density distribution of the underlying ecoregions represented in the analyses with arrows representing the strength and direction of variable influence within the new multidimensional scaled dimensions; and b) the median underlying ecoregion flammability threshold (EFT) binned using those values (8, 12, and 30%) identified as important biophysical thresholds constraining fire ignition and spread in prior research (Boer et al., 2017; Fernandes et al., 2008; Filkov et al., 2019; Flannigan et al., 2016; Nolan et al., 2016; Wotton, 2008) as well as points representing the biome-level mean MDS1 and MDS2 values.