We count calories. Why not carbon?

Thanks to the Food and Drug Administration (FDA), I see that my serving of Honey Nut Cheerios has 110 calories. This, along with dozens of other data points on the box, helps me make educated choices to do right by my body. I'm ready to tackle the day as an informed consumer of food.

Wait! That box: What "ingredients" went into that? Ditto for the plastic liner and all those O's: How many "calories" did it take to manufacture them and then ship them to my table? What's the carbon footprint of my breakfast?

At the store, I can compare cereal carbohydrates but I can't compare how much they cost the planet. I'm not empowered to shop right by the health of the planet. I might as well put on a blindfold.

Americans need to broaden their understanding of energy and its cost. Nearly everything in our homes, from toasters to hair dryers, consumes energy (and emits pollution) from start to finish. But we don't think about that. We think that's the job of the energy companies. We turn down the thermostat and buy reusable bags at the grocery store, but that's about it.

Americans are voracious shoppers. We use more than our fair share of resources in this world. To embrace conservation, shouldn't we consider a product's carbon cost? Take appliances. Many come with an Energy Star rating. We all nod and feel good about it. But this label just shows the relative energy cost of ownership, not the absolute cost of manufacture. I wonder if it is confused with the car device OnStar; consumers may think washers have satellite connections offering emergency assistance for grass stains.

Think about all those products that companies dare to call "green." Unlike "organic," which is a federally regulated label, companies can affix "green" to just about anything, even petroleum-based plastic Easter eggs from China! Head slap. The manufacturers can't be trusted – they're colorblind. By "green," they must mean the color of money. Unless they start making edible sofas, this is beyond the FDA's scope, so who is going to settle this issue?

Misconceptions abound. Most runners don't think they have a negative environmental impact. The runner just runs, right? Hats off to Runner's World magazine for taking a hard look at this question in "The Runner's Footprint." The article showed that the carbon cost associated with a shoe's life cycle can be eye-popping. My husband is a runner. Runners don't like air pollution. So I know a shoe's carbon cost would weigh heavily on his choice.

If price and quality were equal, which widget would you buy – the one that cost 10,000 carbon points or 100? From jeans to washing machines, we need a common metric for the pollution costs that products incur during their life cycles. If we can list the nutritional value of a pickled egg, surely we can drive a healthier market and planet through system-cost comparison.

While we wait for that, we don't have to wait to be smarter shoppers. When we spend money on new products, we spend a great many carbon points. But when we buy repurposed goods at thrift stores, we spend close to zero carbon points. We have choices, but we need to be informed to make responsible ones.

Amy Hardin Turosak writes as Ms. Shopping Golightly at the Thrifty Chicks blog.