Saving the planet might start as simply as putting on a jersey or hat when you are cold, before turning on the heater. Similarly, stripping down a few layers on a hot day means that you need to use the air conditioning unit less to keep you cool. Heaters and air conditioners are energy-intensive, and cutting down on your usage will save you money, and will reduce the amount of fossil fuels being burned to generate electricity.
Source: enviropaedia.com
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