例句：
1. Heating makes up 42 percent of energy utilization.
2. Energy consumption from heating is the largest.
3. Water heating consumes the second largest amount of electricity. 
4. The largest amount of greenhouse gases is emitted from/produced by heating water.
5. Water heating produces the largest amount of greenhouse gases.

6. Other appliances are the second largest emitter/producer of greenhouse gases.

7. Water heating results in the highest emissions.

8. Water heating is responsible for the highest greenhouse gas emissions.

9. Water heating is the largest source of greenhouse gas emissions.