1. Close air then turned to some fans or open windows to air transfer more.
2. Use the stairs instead of elevators. In addition to exercise and will also save the Energy more.
3. If not how far to use the bike. Or walk either. Have to exercise.
4. Reduced by the use of plastic can be recycled, such as cloth bag
5. The water savings.
6. Grow trees. To add oxygen to the air.
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