oven door again and again to check on if the meals are done. but you should understand that every time you open the oven door you’re losing about 25,° out of your oven. this causes your oven to kick on more which also winds up using more electricity. by using a timer and not opening the oven until the food is done you will have the ability to save electricity.
obviously there also other little things you can do in your home in order to save electricity and prevent pollution, you just need to take the initiative to find them. by just changing your light bulbs to the new energy efficient 