Coastal cities like Shanghai are dealing with rising sea levels due to climate change. Chongming Island, a part of Shanghai, has gone through different stages of using its wetlands. In the past, people used the wetlands for salt production, fishing, and farming. Then, they started reclaiming land for industry. Now, they are focusing on protecting the wetlands. This change was driven by factors like sea level rise, population growth, and new policies. In the future, the city can either move away from the coast or stay and find ways to deal with flooding and erosion. Chongming Island is moving towards protecting its wetlands, which can help with coastal problems and provide important services to the ecosystem.