Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Belize Barrier Reef Reserve System' has mentioned 'Human' in the following places:
Occurrence Sentence Text Source
Usually, it is hard to distinguish whether the reason for coral bleaching is human activities or natural reasons such as storms or bacterial fluctuations.
Human population in this area is much more sparse than the corresponding areas near other coral reefs, so the human activity and pollution are much lower compared to other coral reefs and the Belize reef system is in a much more enclosed area.