In 1990, Lyngstad became a member of the committee of the Swedish environmental organization "Det Naturliga Steget" ("The Natural Step"). The organization wanted a "famous face" to help them reach the public, and in 1991 she became chairwoman for the organization "Artister För Miljö" ("Artists For The Environment"). In 1992, Lyngstad founded her Children and Environment Foundation which runs Summer Camps for underprivileged children. Also in 1992, Lyngstad performed live at the Stockholm Water Festival at the Kings Castle and released the environmental charity single with her cover of Julian Lennon's song "Saltwater". All the royalties from this single went to charity. In 1993, on Queen Silvia's 50th birthday, Frida was asked to perform "Dancing Queen" on stage, as performed by ABBA when the king and queen married in 1976. Frida contacted The Real Group and together they performed the song at the Stockholm Opera House in front of the king and queen. The Swedish prime minister at the time, Ingvar Carlsson, also present that night, said it was an ingenious step to do "Dancing Queen" a cappella. This performance was filmed by Swedish TV and can be seen in "Frida - The DVD".