Mend-Ooyo wrote his famous poem "Mother Earth," to promote the protection of the natural world and of cultural heritage, in 1980, and for some thirty years it has been sung to a tune composed by R.Enhbazar. Many of his works, such as Altan Ovoo, speak of the precious links which Mongolian nomads have developed with the earth, and to the link between human beings and the natural world.

Mongolian poets were deeply affected by the destruction of cultural artefacts during the Stalinist purges of the 1930s. Since the late 1980s, at which time his was a voice supporting democratic change, Mend-Ooyo has been publishing articles and essays dedicated to the theme of the revival of cultural heritage. Between 1990 and 1996, he was one of those engaged in establishing the "Mijid Chenrezig" complex, which sought to promote these themes. Since the end of the 1980s, he has also spearheaded the campaign for the revival of the traditional Mongol script and the horsehead fiddle.

From 1999, Mend-Ooyo has been deeply involved with world poetry, and has promoted the recognition of Mongolian poetry throuout the world. The ideas of ecology and culture are continually expressed in the words of his poem "Mother Earth, I Love You."