Some sources of XXX are a vanishing resource, some pollute the environment or produce toxic waste. The challenge of producing sufficient 'clean' XXX has led in recent years to developing re-newable XXX sources.'
UNFCCC.
United Nations Framework Convention on Climate Change.
I guess, having re-visited this QUESTION NO : in 2022, originally written in 2020, the 'CC' at the end of the possible answers, reduces the risk of people selecting a wrong answer.
Doesn't work for 'MCC' though as that stands for 'Marylebone Cricket Club' which was founded in 1787, and is 'the guardian of the laws of cricket'. (Source: MCC)
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