Answer:
•Human Intervention. Human activities add another layer of complexity to the natural processes of coastal lands and materials. ... They may affect sources of new sediment to the coast and the movement of sediment within the coastal environment; they may promote changes in sea level, both local and global.
•However, human activities can also strongly influence the propensity of landforms to erode. For example, the construction of coastal structures (such as breakwaters, groynes and seawalls) can lead to changes in coastal sediment transport pathways, resulting in erosion in some areas and accretion in others.
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