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New approaches need updated database: a critique of Levin et al. 2015.

We recently read the Article entitled “Where have all the people gone? Enhancing global Conservation using night lights and social media” written by Levin et al. (2015) and we strongly agree with the major part of the manuscript's conclusion. The methodology– merging social media with remote sense tools – is indeed very promising and shows strategic areas of focus for tourism in natural areas. This kind of data is extremely useful for public policy or even entrepreneurs looking for areas to invest in and, as a consequence, increasing protected areas. 
 
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