17. Be More Energy Efficient

This is heavily-related to the previous point, but it’s coming at it from a slightly different viewpoint – try to be more efficient when you do have to use energy. For example, wash your laundry with cold water whenever possible, as the hot cycle uses significantly more energy. Use energy-saving light bulbs instead of normal ones. And when using your home computer, use an advanced power strip for convenience – then all of your accessories are turned off with one switch.