what effect are being made for substituting the chemical like cfc why ?
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Two of the chemical classes under consideration for replacing CFCs are hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs). HCFCs contribute to the destruction of stratospheric ozone, but to a much lesser extent than CFCs.
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Summary: The Montreal Protocol led to a global phase-out of most substances that deplete the ozone layer, such as chlorofluorocarbons (CFCs). A happy side-effect of the gradual ban of these products is that the Earth's climate has also benefited because CFCs are also potent greenhouse gases.
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