If only the continental land masses became covered by glaciers, the mean temperature of the planet would drop to about .
ɪf ˈoʊnli ðə kˌɑːntɪnˈɛntəl lˈænd mˈæsᵻz bɪkˌeɪm kˈʌvɚd baɪ ɡlˈeɪʃɚz, ðə mˈiːn tˈɛmpɹɪtʃɚɹ ʌvðə plˈænɪt wʊd dɹˈɑːp tʊ ɐbˈaʊt .