Mapping tree density at a global scale

@article{Crowther2015MappingTD,
  title={Mapping tree density at a global scale},
  author={Thomas. W. Crowther and Henry B. Glick and Kristofer R Covey and Charlie Bettigole and Daniel S. Maynard and S. M. Thomas and Jaya R. Smith and G. Hintler and Marlyse C. Duguid and Giuseppe Amatulli and Mao‐Ning Tuanmu and Walter Jetz and Christian Salas and C. Stam and Daniel Piotto and Rebecca A Tavani and S. Green and G. Bruce and S. J. Williams and Susan K. Wiser and Markus O. Huber and Geerten M. Hengeveld and Gert‐Jan Nabuurs and Elena Tikhonova and Peter Borchardt and C.-F. Li and Leslie Ward Powrie and Markus Fischer and Andreas Hemp and J{\"u}rgen Homeier and P. Cho and Alexander Christian Vibrans and Peter M. Umunay and Shilong Piao and Christine Rowe and M. Ashton and Peter R. Crane and Mark A. Bradford},
  journal={Nature},
  year={2015},
  volume={525},
  pages={201-205}
}
The global extent and distribution of forest trees is central to our understanding of the terrestrial biosphere. We provide the first spatially continuous map of forest tree density at a global scale. This map reveals that the global number of trees is approximately 3.04 trillion, an order of magnitude higher than the previous estimate. Of these trees, approximately 1.30 trillion exist in tropical and subtropical forests, with 0.74 trillion in boreal regions and 0.66 trillion in temperate… 
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