Protected Areas - Joppa, Lucas N. (Microsoft Research, Cambridge, UK) a Bailie, Jonathan E. M. (Institute of Zoology, London, UK) a Robinson, John G. (Bronx Zoo, New York, USA)

Protected areas spearhead our response to the rapidly accelerating biodiversity crisis. However, while the number of protected areas has been growing rapidly over the past 20 years, the extent to which the world s protected areas are effectively conserving species, ecosystems, and ecosystem services is poorly understood.