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R-12 was used in most refrigeration and vehicle air conditioning applications prior to 1994 before being replaced by 1,1,1,2-tetrafluoroethane (R-134a), which has an insignificant ozone depletion potential. Automobile manufacturers began phasing in R-134a around 1993 [citation needed].
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From early 2020 HFCs (including R-404A, R-134a and R-410A) are being superseded: Residential air-conditioning systems and heat pumps are increasingly using R-32. This still has a GWP of more than 600. Progressive devices use refrigerants with almost no climate impact, namely R-290 (propane), R-600a (isobutane) or R-1234yf (less flammable, in cars).
This was more than twice the 409 GWh (0.2%) of generation by Pennsylvania's utility-scale photovoltaic plants. [1] The generating mix in Pennsylvania has been shifting from coal to gas, as in other U.S. states. Extraction of the state's fossil-fuel resources for domestic and foreign export sale ranked among the highest in the nation during 2019 ...
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