Canadian Forest Service Publications
Scientific evidence for fifty percent?. Wiersma, Y. F., Sleep, D. J. H., & Edwards, K. (2017). BioScience, 67(9), 781-782.
Issued by: Atlantic Forestry Centre
Catalog ID: 40403
Availability: PDF (download)
Available from the Journal's Web site. †
† This site may require a fee
Plain Language Summary
An article by Dinerstein and colleagues (2017) presents a useful inventory of the amount of global protected area coverage. This article also provides an assessment on how close the planet is to reaching a target of 50 percent protection. The authors imply that 50 percent is an appropriate, science-based target for protected area coverage. We are concerned with the assumption that the 50 percent target is appropriate and based on scientific evidence. We have read the papers cited by Dinerstein and colleagues as evidence for the 50 percent target. The data we looked at explained that the actual target in each region may vary. The targets in the cited papers varied from a range for 10 percent to 100 percent. It is unreasonable to suggest that this wide data range could be described in a general statement such as “about half” based on a single target. While simple targets are appealing for policy development, policymakers will benefit from clear communication with scientists.