Refrigeration and air conditioning are among the largest sources of carbon, and the refrigerants we use are greenhouse gases, too. But green refrigerants are on the way, from elastocaloric cooling to a method a bit like salting an icy road.
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Sources:
https://iopscience.iop.org/article/10.1088/1742-6596/1599/1/012001/pdf
https://iopscience.iop.org/article/10.1088/1361-6463/50/5/053002
https://www.sciencedirect.com/science/article/abs/pii/S0017931021004750
https://www.science.org/doi/10.1126/science.ade1696
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https://www.gettyimages.com/detail/photo/model-royalty-free-image/183387896
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