Formed in 1992, after it became clear that Labor wasn’t going to follow through on promises of ‘Ecologically Sustainable Development. Gradually gaining in strength/size since then.
Crucially, won a lower house seat in 2010 and Gillard needed that vote so agreed to an emissions trading scheme/other supportive acts that became the CEF (2011 legislation).
Critiqued by environmentalists for being neo-liberal (advocating market solutions etc)
See also Bob Brown, Christine Milne etc