Allen, C. D. et al. A global overview of drought and heat-induced tree mortality reveals emerging climate change risks for forests. Forest Ecol. Manage. 259, 660–684 (2010).
Zhao, M. & Running, S. W. Drought-induced reduction in global terrestrial net primary production from 2000 through 2009. Science 329, 940–943 (2010).
Van Mantgem, P. J. et al. Widespread increase of tree mortality rates in the western United States. Science 323, 521–524 (2009).
Beck, P. S. A. et al. Changes in forest productivity across Alaska consistent with biome shift. Ecol. Lett. 14, 373–379 (2011).
Breshears, D. D. et al. Regional vegetation die-off in response to global-change-type drought. Proc. Natl Acad. Sci. USA 102, 15144–15148 (2005).
Phillips, O. L. et al. Drought sensitivity of the Amazon rainforest. Science 323, 1344–1347 (2009).
Lewis, S. L., Brando, P. M., Phillips, O. L., van der Heijden, G. M. F. & Nepstad, D. The 2010 amazon drought. Science 331, 554 (2011).
Peng, C. et al. A drought-induced pervasive increase in tree mortality across Canada’s boreal forests. Nature Clim. Change 1, 467–471 (2011).
Bentz, B. J. et al. Climate change and bark beetles of the western United States and Canada: Direct and indirect effects. Bioscience 60, 602–613 (2010).
Schwalm, C. R. et al. Reduction in carbon uptake during turn of the century drought in western North America. Nature Geosci. 5, 551–556 (2012).
Williams, A. P. et al. Forest responses to increasing aridity and warmth in the southwestern United States. Proc. Natl Acad. Sci. USA 107, 21298–21294 (2010).
Weiss, J. L., Castro, C. L. & Overpeck, J. T. Distinguishing pronounced droughts in the southwestern United States: Seasonality and effects of warmer temperatures. J. Clim. 22, 5918–5931 (2009).
Swetnam, T. W. & Betancourt, J. L. Mesoscale disturbance and ecological response to decadal climatic variability in the American Southwest. J. Clim. 11, 3128–3147 (1998).
Diffenbaugh, N. S., Ashfaq, M. & Scherer, M. Transient regional climate change: Analysis of the summer climate response in a high-resolution, century-scale ensemble experiment over the continental United States. J. Geophys. Res. 116, D24111 (2011).
Seager, R. et al. Model projections of an imminent transition to a more arid climate in southwestern North America. Science 316, 1181–1184 (2007).
McDowell, N. G. et al. Mechanisms of plant survival and mortality during drought: Why do some plants survive while others succumb to drought? New Phytol. 178, 719–739 (2008).
Fritts, H. C. Tree Rings and Climate (Academic, 1976).
Cook, E. R., Woodhouse, C. A., Eakin, C. M., Meko, D. M. & Stahle, D. W. Long-term aridity changes in the western United States. Science 306, 1015–1018 (2004).
McDowell, N. G., Allen, C. D. & Marshall, L. Growth, carbon-isotope discrimination, and drought-associated mortality across a Pinus ponderosa elevational transect.
Glob. Change Biol. 16, 399–415 (2010).
St. George, S., Meko, D. M. & Cook, E. R. The seasonality of precipitation signals embedded within the North American Drought Atlas. Holocene 20, 983–988 (2010).
Adams, H. D. et al. Temperature sensitivity of drought-induced tree mortality portends increased regional die-off under global change-type drought. Proc. Natl Acad. Sci. USA 106, 7063–7066 (2009).
McDowell, N. G. et al. The interdependence of mechanisms underlying climate-driven vegetation mortality. Trends Ecol. Evol. 26, 523–532 (2011).
Shaw, J. D., Steed, B. E. & DeBlander, L. T. Forest inventory and analysis (FIA) annual inventory answers the question: What is happening to pinyon-juniper woodlands? J. Forestry 103, 280–285 (2005).
Huang, C., Asner, G. P., Barger, N. N., Neff, J. C. & Floyd, M. L. Regional aboveground live carbon losses due to drought-induced tree dieback in piñon–juniper ecosystems. Remote Sens. Environ. 114, 1471–1479 (2010).
Raffa, K. F. et al. Cross-scale drivers of natural disturbances prone to anthropogenic amplification: The dynamics of bark beetle eruptions. Bioscience 58, 501–517 (2008).
Grissino Mayer, H. D. & Swetnam, T. W. Century scale climate forcing of fire regimes in the American Southwest. Holocene 10, 213–220 (2000).
Westerling, A. L., Hidalgo, H. G., Cayan, D. R. & Swetnam, T. W. Warming and earlier spring increase western US forest wildfire activity. Science 313, 940–943 (2006).
Furniss, R. L. & Carolin, V. M. Western Forest Insects (United States Department of Agriculture (USDA) Forest Service (FS), 1977).
Allen, C. D. Interactions across spatial scales among forest dieback, fire, and erosion in northern New Mexico landscapes. Ecosystems 10, 797–808 (2007).
Allen, C. D. & Breshears, D. D. Drought-induced shift of a forest-woodland ecotone: Rapid landscape response to climate variation. Proc. Natl Acad. Sci. USA 95, 14839–14842 (1998).
Betancourt, J. L., Pierson, E. A., Rylander, K. A., Fairchild-Parks, J. A. & Dean, J. S. in Managing Piñon-juniper Ecosystems for Sustainability and Social Needs (eds Aldon, A. F. & Shaw, D. W.) 42–62 (USDA Forest Service, 1993).
Savage, M. & Mast, J. N. How resilient are southwestern ponderosa pine forests after crown fires? Can. J. Forest Res. 35, 967–977 (2005).
Swetnam, T. W. & Betancourt, J. L. Fire-southern oscillation relations in the southwestern United States. Science 249, 1017–1020 (1990).
Herweijer, C., Seager, R., Cook, E. R. & Emilie-Geay, J. North American droughts of the last millennium from a gridded network of tree-ring data. J. Clim. 20, 1353–1376 (2007).
Potter, L. D. Phytosociological study of San Augustin Plains, New Mexico. Ecol. Monogr. 27, 114–136 (1957).
Plummer, F. G., Rixon, T. F. & Dodwell, A. Forest Conditions in the Black Mesa Forest Reserve, Arizona. Series H (Government Printing Office, 1904).
Stahle, D. W. et al. Tree-ring data document 16th century megadrought over North America. EOS Trans. 81, 121–121 (2000).
Grissino-Mayer, H. D. in Tree Rings, Environment, and Humanity (eds Dean, J. S., Meko, D. M. & Swetnam, T. W.) 191–204 (Radiocarbon, 1996).
Dean, J. S. The medieval warm period on the southern Colorado Plateau. Climatic Change 26, 225–241 (1994).
Fall, P. L., Kelso, G. & Markgraf, V. Paleoenvironmental reconstruction at Canyon del Muerto, Arizona, based on principal-component analysis. J. Archaeol. Sci. 8, 297–307 (1981).
IPCC Special Report on Emissions Scenarios (eds Nakicenovic, N. & Swart, R.) (Cambridge Univ. Press, 2000).
Williams, A. P., Michaelsen, J., Leavitt, S. W. & Still, C. J. Using tree rings to predict the response of tree growth to climate change in the continental United States during the twenty-first century. Earth Interact. 14, 1–20 (2010).
Jackson, S. T., Betancourt, J. L., Booth, R. K. & Gray, S. T. Ecology and the ratchet of events: climate variability, niche dimensions, and species distributions. Proc. Natl Acad. Sci. USA 106, 19685–19692 (2009).
Goforth, B. R. & Minnich, R. A. Densification, stand-replacement wildfire, and extirpation of mixed conifer forest in Cuyamaca Rancho State Park, southern California. Forest Ecol. Manage. 256, 36–45 (2008).
Räisänen, J. CO2-induced climate change in CMIP2 experiments: Quantification of agreement and role of internal variability. J. Clim. 14, 2088–2104 (2001).
Marlon, J. R. et al. Long-term perspective on wildfires in the western USA. Proc. Natl Acad. Sci. USA 109, E535–E543 (2012).
Cayan, D. R. et al. Evolution toward greater droughts in the SW United States.
Proc. Natl Acad. Sci. USA 107, 21271–21276 (2010).
Held, I. M. & Soden, B. J. Robust responses of the hydrological cycle to global warming. J. Clim. 19, 5686–5699 (2006).
Seager, R., Naik, N. & Vecchi, G. A. Thermodynamic and dynamic mechanisms for large-scale changes in the hydrological cycle in response to global warming. J. Clim. 23, 4651–4668 (2010).
Seidel, D. J., Fu, Q., RanDel, W. J. & Reichler, T. S. J. Widening of the tropical belt in a changing climate. Nature Geosci. 1, 21–24 (2008).