Caroline will tell you why:
"The one thing we have that the other parties do not have is a political integrity. No one thinks you join the Green party because you're politically ambitious, or have your own agenda."
I'm eternally frustrated to hear people brand the Greens as "ideologues" and unrealistic. If any model of government is unrealistic, its that of the grey parties. Government' are meant to look after the short AND the long-term interests of the nation. How is presiding over increases in equality, an economic collapse and an abject failure to seriously address climate change sustainable? Funny how the Chairman of the government's Sustainable Development Commission is a member of the Green Party. That should tell people something.