A Global Map of Roadless Areas and Their Conservation Status. Ibisch, P. L., Hoffmann, M. T., Kreft, S., Pe'er, G., Kati, V., Biber-Freudenberger, L., DellaSala, D. A., Vale, M. M., Hobson, P. R., & Selva, N. 354(6318):1423–1427.
A Global Map of Roadless Areas and Their Conservation Status [link]Paper  doi  abstract   bibtex   
[Too many roads] Roads have done much to help humanity spread across the planet and maintain global movement and trade. However, roads also damage wild areas and rapidly contribute to habitat degradation and species loss. Ibisch et al. cataloged the world's roads. Though most of the world is not covered by roads, it is fragmented by them, with only 7\,% of land patches created by roads being greater than 100 km2. Furthermore, environmental protection of roadless areas is insufficient, which could lead to further degradation of the world's remaining wildernesses. [Abstract] Roads fragment landscapes and trigger human colonization and degradation of ecosystems, to the detriment of biodiversity and ecosystem functions. The planet's remaining large and ecologically important tracts of roadless areas sustain key refugia for biodiversity and provide globally relevant ecosystem services. Applying a 1-kilometer buffer to all roads, we present a global map of roadless areas and an assessment of their status, quality, and extent of coverage by protected areas. About 80\,% of Earth's terrestrial surface remains roadless, but this area is fragmented into ̃600,000 patches, more than half of which are $<$1 square kilometer and only 7\,% of which are larger than 100 square kilometers. Global protection of ecologically valuable roadless areas is inadequate. International recognition and protection of roadless areas is urgently needed to halt their continued loss.
@article{ibischGlobalMapRoadless2016,
  title = {A Global Map of Roadless Areas and Their Conservation Status},
  author = {Ibisch, Pierre L. and Hoffmann, Monika T. and Kreft, Stefan and Pe'er, Guy and Kati, Vassiliki and Biber-Freudenberger, Lisa and DellaSala, Dominick A. and Vale, Mariana M. and Hobson, Peter R. and Selva, Nuria},
  date = {2016-12},
  journaltitle = {Science},
  volume = {354},
  pages = {1423--1427},
  issn = {0036-8075},
  doi = {10.1126/science.aaf7166},
  url = {https://doi.org/10.1126/science.aaf7166},
  abstract = {[Too many roads]

Roads have done much to help humanity spread across the planet and maintain global movement and trade. However, roads also damage wild areas and rapidly contribute to habitat degradation and species loss. Ibisch et al. cataloged the world's roads. Though most of the world is not covered by roads, it is fragmented by them, with only 7\,\% of land patches created by roads being greater than 100 km2. Furthermore, environmental protection of roadless areas is insufficient, which could lead to further degradation of the world's remaining wildernesses.

[Abstract]

Roads fragment landscapes and trigger human colonization and degradation of ecosystems, to the detriment of biodiversity and ecosystem functions. The planet's remaining large and ecologically important tracts of roadless areas sustain key refugia for biodiversity and provide globally relevant ecosystem services. Applying a 1-kilometer buffer to all roads, we present a global map of roadless areas and an assessment of their status, quality, and extent of coverage by protected areas. About 80\,\% of Earth's terrestrial surface remains roadless, but this area is fragmented into ̃600,000 patches, more than half of which are {$<$}1 square kilometer and only 7\,\% of which are larger than 100 square kilometers. Global protection of ecologically valuable roadless areas is inadequate. International recognition and protection of roadless areas is urgently needed to halt their continued loss.},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-14325527,anthropogenic-changes,connectivity,conservation,fragmentation,global-scale,networks,roads,transport-system,wilderness},
  number = {6318}
}
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