Refrigeration by evaporative cooling

I enjoyed this Worldchanging interview with Emily Cummins, an accomplished inventor of sustainable technology, including a refrigerator that works without electricity:

Emily Cummins: My sustainable refrigerator operates without using any electricity. Instead, it keeps its contents cool and dry by harnessing the evaporation method of keeping cool – in fact, it works in exactly the same way as humans cool down by sweating!

The fridge, for me, is important in two ways. Firstly, it’s a genuine working model which people in Africa are now using after I gave away the design there for free. Secondly, it makes a statement to people in the UK and US – it proves we don’t need to rely on electricity as much as we do.