Rank the following places from greatest to least in terms of environmental impact: factory, coal power plant, oil rig
1. Coal Power Plant
2. Oil Rig
3. Factory
Complete the following task based on the instruction and optional input provided.### Instruction:
Rank the following places from greatest to least in terms of environmental impact: factory, coal power plant, oil rig

### Output:
1. Coal Power Plant
2. Oil Rig
3. Factory