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Before the construction of the pipeline , one could walk over a very wide area , keeping erosion quite low , but as there is now fence surrounding the pipeline , gates have been set up to allow access to other areas beyond Mynydd Fforest , although there are few gates , so , while in the past people and vehicles were spread over a wide area , they have been funneled into few gates , increasing erosion and habitat loss .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None