Methane is present in what is called biogas, produced by animals and decaying matter, which is a possible renewable energy source.
mˈɛθeɪn ɪz pɹˈɛzənt ɪn wʌt ɪz kˈɔːld bˌaɪoʊɡˈæs, pɹədˈuːst baɪ ˈænɪməlz ænd dᵻkˈeɪɪŋ mˈæɾɚ, wˌɪtʃ ɪz ɐ pˈɑːsᵻbəl ɹᵻnˈuːəbəl ˈɛnɚdʒi sˈoːɹs.