Map: Increase in mean fuel aridity

John T. Abatzogloua and A. Park Williams | PNAS

Standardized change in each of the eight fuel aridity metrics due to anthropogenic climate change (ACC). The influence of ACC on fuel aridity during 2000–2015 is shown by the difference between standardized fuel aridity metrics calculated from observations and those calculated from observations excluding the ACC signal. The sign of PDSI is reversed for consistency with other aridity measures.