It was founded in November 2009 by those members of the Federation of the Greens who wanted to continue the experience of Left and Freedom (SL), a left-wing coalition that was abandoned by the Greens in October, and took part to the foundation of Left Ecology Freedom (SEL) as a united party. Initially, the Ecologists were a minority faction within the Federation. Subsequently, they left the Greens to join Left Ecology Freedom.
- Spokesperson: Loredana De Petris
- "Soggetti politici | Politica Semplice". politicasemplice.it. Archived from the original on 2013-12-13.
- Giampaolo Pansa (2013-04-03). Tipi sinistri: I gironi infernali della casta rossa. Bur. p. 163. ISBN 978-88-586-4387-7.
- Radicale, Radio (8 November 2009). "Assemblea nazionale costitutiva dell'Associazione Ecologisti di Sinistra e Libertà". Radio Radicale.
- "Lavocetta: Nasce una nuova Associazione politica Ecologista". Lavocetta.blogspot.com. 9 November 2009. Retrieved 2011-08-12.
- "Assemblea nazionale costitutiva dell'Associazione Ecologisti di Sinistra e Libertà" (in Italian). RadioRadicale.it. 2009-11-08. Retrieved 2011-08-12.