A human-driven decline in global burned area
Burn less, baby, burn less
Humans have, and always have had, a major impact on wildfire activity, which is expectedto increase in our warming world. Andela et al. use satellite data toshow that, unexpectedly, global burned area declined by ∼25% over the past 18years, despite the influence of climate. The decrease has been largest in savannas andgrasslands because of agricultural expansion and intensification. The decline of burnedarea has consequences for predictions of future changes to the atmosphere, vegetation,and the terrestrial carbon sink.
Science, this issue p. 1356
Abstract
Fire is an essential Earth system process that alters ecosystem and atmospheric composition. Here we assessed long-term fire trends using multiple satellite data sets. We found that global burned area declined by 24.3 ± 8.8% over the past 18 years. The estimated decrease in burned area remained robust after adjusting for precipitation variability and was largest in savannas. Agricultural expansion and intensification were primary drivers of declining fire activity. Fewer and smaller fires reduced aerosol concentrations, modified vegetation structure, and increased the magnitude of the terrestrial carbon sink. Fire models were unable to reproduce the pattern and magnitude of observed declines, suggesting that they may overestimate fire emissions in future projections. Using economic and demographic variables, we developed a conceptual model for predicting fire in human-dominated landscapes.
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Supplementary Material
Summary
Materials and Methods
Figs. S1 to S18
Tables S1 to S6
Resources
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Volume 356 | Issue 6345
30 June 2017
30 June 2017
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Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
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Received: 22 November 2016
Accepted: 2 June 2017
Published in print: 30 June 2017
Acknowledgments
N.A, Y.C., and J.T.R. received funding from the Gordon and Betty Moore Foundation (grant GBMF3269). D.C.M. was supported by NASA’s Interdisciplinary Science and Carbon Monitoring System Programs. G.R.v.d.W. was supported by the Netherlands Organisation for Scientific Research (NWO), S.H. by the EU FP7 projects BACCHUS (grant 603445) and LUC4C (grant 603542), F.L. by the National Science Foundation of China (grant 41475099), and C.Y. by the European Space Agency Fire_CCI project. We thank M. N. Deeter for helpful suggestions on the CO analysis. The authors declare that they have no competing interests. Data used in this study are available at www.globalfiredata.org, https://reverb.echo.nasa.gov/, http://gpcp.umd.edu/, www.fao.org, and http://web.ornl.gov/sci/landscan/ and are described in more detail in the supplementary materials. FireMIP model simulation output is archived with the supporting information, and full data sets are available on request.
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