In the last two decades, there has been an increasing trend to implement CWs in protected areas, such as national or natural parks in all continents (e.g., in Europa: Italy [ 21 , 22 ], Spain [ 16 , 23 ], Poland [ 24 ]; America [ 25 , 26 ]; Asia [ 27 ]; Africa [ 28 ]; Oceania [ 29 ], etc.).
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