| 1 | Carbon dioxide is the planet's thermostat. | |
| 2 | It is, after all, a thermostat. | |
| 3 | You should / ought to turn down your thermostat to save energy. | |
| 4 | Turn off your thermostat when you' re not home. | |
| 5 | Millions of homes are stillequipped with manual thermostats. |
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