1. **Answer**:
- Topic sentence: The problem of environmental pollution is becoming increasingly serious.
- Supporting idea 1: Minimize plastic waste.
- Detail: Encourage the use of cloth bags instead of plastic bags.
- Supporting idea 2: Increase recycling.
- Detail: Providing sorted trash bins in public areas.
- Supporting idea 3: Raising community awareness.
- Detail: Organize seminars on environmental protection.
2. **Explain why that is the answer**:
- Topic sentence clearly states the main issue that the paragraph will discuss, helping readers immediately understand the main content.
- The selected supporting ideas are all feasible and implementable solutions to solve the problem of environmental pollution.
- Each supporting idea has specific details, helping to clarify and illustrate the solution, thereby creating a stronger and more convincing argument for the paragraph.