This is a song by Phillip Palmer, UU Hymn 1063. We found it in John Halstead's description of his Family Winter Solstice Ritual and sang it at the Longest Night Masquerade.
Lyrics
Child – ren of the Earth, we have come to sing to each oth – er, Sist – er to Broth – er, songs of our Moth – er Earth.
Children of the Earth, Autumn soon will breathe her last breath and quick will hear death bear witness to Winter’s Birth.
Children of the Earth, can you feel the air getting cold as darkness takes hold and sleep covers Mother Earth?
Children of the Earth, we have come to sit in the darkness, breathe in the silence, think of our Mother Earth.