ðɪs kənˈɛkʃən ɪz ɪmpˈoːɹtənt bɪkˈʌz ɐ sɪɡnˈɪfɪkənt vˌɛɹɪəbˈɪlᵻɾi ɪnðə jˈɪɹli nˈʌmbɚɹ ʌv nˈɑːktɪlˌuːsənt"ɡlˈoʊ ɪnðə dˈɑːɹk"klˈaʊdz ˌɛnˌɛlsˌiːˈɛs, wˈʌn mˌænɪfɪstˈeɪʃən ʌv pˌiːˌɛmsˈiːz, hˈæzbiːn sədʒˈɛstᵻd æz ɐn ˈɪndᵻkˌeɪɾɚɹ ʌv ɡlˈoʊbəl tʃˈeɪndʒ.
This connection is important because a significant variability in the yearly number of noctilucent ("glow in the dark") clouds (NLCs), one manifestation of PMCs, has been suggested as an indicator of global change.