Fig. 4.

ERCCI (evolutionary regional climate change index) projection with larger circles (higher ERCCI values) representing greater predicted impact as a linear function of fitness changes from precipitation and temperature change and changes in the variability of temperature and precipitation. The index is relative such that comparisons can be made between regions but the magnitude is unknown and dependent on a variety of factors including future emissions—i.e., a small circle does not suggest that there will be small impacts in a given region, only that the impacts are projected to be smaller for that region compared with a region with a larger circle.