Crystals, jets and magnets — is this how to make cooling greener?

In a world scorched by climate change, cooling technology is far from a luxury. It saves lives, keeps food fresh and ensures comfort at home or in the office. Ten new air conditioners are to be sold every second between now and 2050, according to the International Energy Agency. But all those machines, running for hours on end, gobble up vast quantities of electricity. These devices also tend to contain refrigerant gases that are many thousands of times more damaging in terms of global warming potential than CO2. The gases gradually leak, including after old air conditioning units or fridges…

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