I am always trying to reduce my energy usage/ carbon footprint/ impact on the earth, etc. But sometimes it's really hard to know how to do that.
For example, how many fans do you have to run all night, before it would be more energy efficient just to close up the house and run the central air?
I was thinking this last night as I ran burners on my stove for heating water and then canning, for simmering soup stock, for cooking, and the oven for baking a casserole. All this in the name of eating locally grown food that hasn't been trucked all over the country. Leaving the questions of health, what's good for body and soul out of it, how do I figure out in energy efficiency/ earth impact terms, whether this is really a good thing to be doing, vs say buying prepared food and nuking it briefly (and recycling the packaging). (I am sure in energy terms the best thing I did was steam the green beans in the microwave then throw them in the freezer, which runs all the time anyway.)
How do people figure this stuff out?