A special Sunday survey, because John raised one of those questions of cosmic consequence- should you preheat your oven? Bakers say yes- "Absolutely preheat your oven for baking. Baked goods rely upon a preheated and hot oven in order to bake properly or to have some sort of characteristic form during the first 10 minutes of baking." Others say no: "Ignore cookbooks! It is usually unnecessary to pre-heat your oven before cooking, except when baking bread or pastries. Just turn on the oven at the same time you put the dish in." and some even go further: "Around a half pound of carbon will be saved every time you do not preheat the oven. If you use your oven to bake twice a week, this could add up to an annual savings of close to 50 pounds of carbon. By not opening the oven door, using the microwave for smaller heating jobs, and covering boiling pots of water so less heat is lost, an additional 85 pounds of carbon can be saved each year."