What can people build to reduce erosion by the shore?

To reduce erosion by the shore, people can build structures such as seawalls, which act as barriers to protect the coastline from wave impact. Additionally, groins can be constructed to trap sand and widen beaches, while vegetative buffers made of plants can help stabilize the soil and absorb wave energy. Beach nourishment, which involves adding sand to eroded beaches, is another effective method to combat shoreline erosion.