(Natural refrigerant) The Cool War refers to the debate about the next-generation refrigerant in car air conditioning worldwide, with an ongoing dispute between the Alliance for CO2 Solutions supporting the uptake of sustainable carbon dioxide (CO2)as a refrigerant in passenger cars, and
Herschel 8
Entrance to an ice hut. The whalers who overwintered at Herschel Island dug a natural 'freezer' into the permafrost where meat and fish could be kept until needed.
Pot in Pot
refrigeration.
After explaining pot in pot refrigeration to my son he made a 'refrigerator' for his gnome to keep the freshly caught lego fish in. ;)