refrigerants altogether and instead use sound waves to pump heat,
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, though the technology is currently energy inefficient and takes up too much space, says Stephen Yurek,
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, president of the Air-Conditioning, Heating and Refrigeration Institute in Arlington, Va. “There’s a lot of opportunity for new and creative ideas on how to do this,” he says.
One approach already in use is HFO-1234yf,
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, a refrigerant used in car air conditioners. Each molecule contains a double bond between two carbon atoms that serves as an intentional fatal flaw,
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, breaking the molecule apart once it leaks into the atmosphere. The result of a joint venture between Honeywell and chemical company DuPont,
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, HFO-1234yf’s design results in a global warming potential just a few thousandths that of its predecessor.
Even with a short lifetime, a chemical can still contribute to global warming. R-134a was considered as a replacement refrigerant in freezers because it has a small global warming impact once in the atmosphere. The chemical makes the freezer more energy-hungry,
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, though, says chemical engineer Paul Blowers of the University of Arizona in Tucson. In a 2010 paper in Environmental Science & Technology,
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, he calculated that using R-134a would actually increase a freezer’s total climate impact due to the increased energy use.
Some potential downsides, such as reduced energy efficiency, can be tested before implementation,
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, but others can’t, Blowers says. CFCs were invented decades before their link to ozone depletion

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