Population Matters was launched as the Optimum Population Trust following a meeting on 24 July 1991 by the late David Willey and others concerned about population numbers and sustainability.
pˌɑːpjʊlˈeɪʃən mˈæɾɚz wʌz lˈɑːntʃt æz ðɪ ˈɑːptɪməm pˌɑːpjʊlˈeɪʃən tɹˈʌst fˈɑːloʊɪŋ ɐ mˈiːɾɪŋ ˌɔn twˈɛnti fˈoːɹ dʒuːlˈaɪ nˈaɪntiːnhˈʌndɹɪd nˈaɪnti wˈʌn baɪ ðə lˈeɪt dˈeɪvɪd wˈɪli ænd ˈʌðɚz kənsˈɜːnd ɐbˌaʊt pˌɑːpjʊlˈeɪʃən nˈʌmbɚz ænd səstˌeɪnəbˈɪlᵻɾi.