Answer:
A. Introducing non-native plants and animals
B. Cutting canals
D. Building levees and other flood control structures
Step-by-step explanation:
Human activities have significantly contributed to coastal erosion of wetlands in Louisiana. Introducing non-native plants and animals can disrupt the natural balance of wetland ecosystems, leading to the degradation of native vegetation and wildlife habitats.
Cutting canals, such as for navigation or oil and gas exploration, can alter the hydrology of wetlands. This can cause increased saltwater intrusion, reduced freshwater flow, and loss of sediment deposition, all of which contribute to wetland loss and erosion.
Building levees and other flood control structures, while aimed at protecting human settlements from flooding, can have unintended consequences for wetlands. By restricting the natural flow of sediment and freshwater into wetland areas, these structures disrupt the natural processes that sustain wetland health and can lead to erosion and subsidence.
Restoration projects, on the other hand, are aimed at mitigating the impacts of human activities and restoring wetland habitats. They are not a factor contributing to coastal erosion but rather an effort to counteract its effects and promote wetland preservation and recovery.
Therefore, options A, B, and D are ways in which humans have contributed to coastal erosion of the wetlands in Louisiana. Option C, restoration projects, is not a factor contributing to erosion but rather a measure to combat and mitigate its effects.