There are around 6,000 cargo vessels out on the ocean right now, carrying 20,000,000 shipping containers, which are delivering most of the products you see around you. And among all the containers are a special subset of temperature-controlled units known in the global cargo industry, in all seriousness, as reefers.

70% of what we eat passes through the global cold chain, a series of artificially-cooled spaces, which is where the reefer comes into play.

For this story, Nicola Twilley, reporter and founder of Edible Geography, spoke with Barbara Pratt, Director of Refrigerated Services at Maersk.