September 10, 2009
Graph of the Day: Pine Dieback Around Four Corners, 1997-2004
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,
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