Only with the discovery of an ozone hole over Antarctica in 1985 did chemical companies finally relinquish their opposition to a ban on chlorofluorocarbons (CFCs), which destroy ozone. The discovery suggested that strong political action to halt production of CFCs might be (i), and fortunately, the chemical industry no longer felt compelled to oppose such action: although companies had recently (ii) their research into CFC substitutes, studies they had initiated years earlier had produced (iii) results.
Blank (i): imminent, imprudent, prematureBlank (ii): corroborated, publicized, curtailedBlank (iii): encouraging, inclusive, unsurprising
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