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HCFCsHCFCs were originally introduced as a solution to help phase out the use of CFCsCFCs. Which of the following most likely contributed to the increased levels of HCFCsHCFCs in the stratosphere over the past 30 years?AThermal inversions in the troposphereBConversion of CO2CO2 to HCFCsHCFCs in the troposphereCReduced albedo in the Arctic because of climate changeDLeaking of refrigeration and air-conditioning units

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