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Negative Issues in Mayon Volcano. Acidic gases and ash produced by volcanos can cause respiratory issues to children primarily, but also to adults. Volcanic ash can also damage machinery and, once mixed with water, can collapse the roofs of buildings. Ash produced by volcanos can have an impact hundreds of kilometres from its origin.
Negative Issues in Puerto Princesa Underground River.The current condition of the ‘outstanding natural phenomena’ including the underground river and the karst landscape, remains good and overall the trend remains stable despite the threats faced by the site, specifically those from increasing visitation. However, the biodiversity values of the site are under increasing threat due to the impacts resulting from increasing tourism and visitation, illegal activities including poaching and logging, land clearing and developments, alongside an expanding local population, which is gradually eroding the integrity of the habitats and the biodiversity they support within and around the site.
Negative Issues in Boracay. Among the major findings on the condition of Boracay Island include beach erosion, disappearance of wetlands, high concentration of fecal coliform in Bolabog Beaches and pollution caused by improper waste management and encroachment of protected areas by illegal structures.
Negative Issues in Chocolate Hills. Being alienable and disposable lands, the Chocolate Hills are seen as quarrying assets and source of income for small-scale miners, as well as quarry materials for the province's construction projects.
Explanation:
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