Its first formation was from 11 January 2012 to 29 June 2017 that included representatives of Europe Ecology – The Greens (EELV).

After the appointment of Socialists Nicole Bricq and Hélène Conway-Mouret to the government, ecologists Hélène Lipietz and Kalliopi Ango Ela entered the Senate to become the 11th and 12th members of the group.

[2] After the rout of the socialists in the 2014 municipal elections, Prime Minister Jean-Marc Ayrault presented the resignation of his government,[3] reducing the ecologist group to 10 deputies once more as Bricq and Conway-Mouret returned to their seats in the Senate.

[4] Placé remained president of the group until his appointment to the government,[5] with Corinne Bouchoux taking his place on 15 February 2016,[6] having previously co-chaired the group from 6 November to 13 December 2015.

[9] Bouchoux concluded her term as president of the group on 3 May 2016, becoming a Secretary of the Bureau of the Senate,[6] and was succeeded in her post by Jean Desessard on 4 May.