Acreage of piñon pine (Pinus edulis) dieback from 1997–2004 in the Four Corners States of Arizona, New Mexico, Colorado, and Utah.   Acreage of ponderosa pine (Pinus ponderosa) dieback from 1997–2004 in the Four Corners States of Arizona, New Mexico, Colorado, and Utah.

Figure 3.6. Graph of the acreage of piñon pine (Pinus edulis) and ponderosa pine (Pinus ponderosa) dieback from 1997–2004 in the Four Corners States of Arizona, New Mexico, Colorado, and Utah. Based upon annual aerial forest insect and disease activity inventories by the U.S. Forest Service.

Thresholds of Climate Change in Ecosystems [pdf], U.S. Climate Change Science Program, Synthesis and Assessment Product 4.2, January 2009,