Buying Frozen Veggies Versus Canned: Which is Greener?

Recently I got an email from a reader who had read one of my posts comparing the energy usage and general environmental impact of an electric bicycle and electric scooter. The reader wanted to know which was the greener option: Buying frozen vegetables or buying them in a can? A quick glance at the book Food, Energy & Security is an illuminating and concise answer—a rarity when dealing with these sorts of questions: ...