Final answer:
Human activity such as dredging can contribute to coastal erosion, while rising sea levels caused by global warming can lead to increased coastal flooding. It is important to implement sustainable coastal management practices to address these issues.
Step-by-step explanation:
Human activity can contribute to coastal erosion through actions such as dredging, which can damage ecosystems and increase the impact of storms on shorelines. For example, dredging projects can lead to the destruction of reefs and sea grass beds, threatening local fisheries and tourism. Additionally, rising sea levels caused by global warming can exacerbate coastal erosion and increase the frequency and severity of coastal flooding. This can result in the destruction of human structures in coastal areas. It is important to address these issues by implementing sustainable coastal management practices and reducing greenhouse gas emissions.