First of all, the nuances of how a particular food item is sourced can't possibly be taken into account. For instance, I ate homemade granola with local milk from pastured cows. The closest thing on their list is possibly yogurt and granola with seasonal fruit. For me, it just highlights how complex these things really become. Plus, it doesn't seem to support side by side comparison, which is something I would like to be able to do. The way to hack around this is to add something to the frying pan to see how much the impact 'thermometer' goes up and then remove it and add something else.
The idea is definitely interesting in that it might get someone to think about the environmental impact of food choices, but unfortunately, I don't think it can be boiled down to a simple number.
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