Here’s a super easy way to “green” your cooking habits.  When a recipe calls for pre-heating the oven, skip it. Unless you’re baking bread or complicated French pastries, just put your food in immediately.  Seriously, everything will be fine. Not only will your food taste just as great, but you’ll be saving time, money and energy as well.
Also, skip the peeking. Every time you open the oven door just to see if your chicken is golden brown yet, you’re wasting energy. Use a timer instead and if you still feel the need to peek, simply turn on the light and peer through that little window on the front of the oven. That’s what it’s there for, after all.