Here is the translation of the sentences into English:

1. What will happen if we continue to cause water source pollution?
2. If we maintain activities that cause water source pollution, there will be many diseases.
3. Unless we stop activities that cause water source pollution, it will adversely affect the tourism industry.
4. If there is too much trash in public parks, there will be fewer people who want to visit the parks.
5. Natural disasters will negatively affect the environment.
6. We can reduce the pollution risk by protecting nature.
7. Human health will deteriorate if we continue to destroy the environment.