A Back To Basics idea.
Before electricity, people would dig an underground storage area or room which surrounded by the earth would retain stable and cool temperatures year round.
You can easily build your own with a large plastic container or a garbage container, anything that can be securely closed against vermin or before you do, have a look here at this Groundfridge from Weltevree.
You might like their mission statement that speaks of wanting to contribute to a sustainable, social and inspiring environment.
And underground refrigerators really do symbolise the idea of sustainability...
