Sian Berry (born 9 July 1974 in Cheltenham, Gloucestershire) is an English politician and member of the Green Party of England and Wales. She was previously one of the Green Party's Principal Speakers (2006-2007). She was selected as the party's candidate in the 2008 London mayoral election.
- Gordon Brown thinks you should solve climate change by changing your lightbulbs. We think you should solve climate change by changing your Government.
- Keynote Speech, GP Autumn Conference 2007, Liverpool 
- Boris Johnson has real contempt for Londoners. He hates that we celebrate each other's heritage; he hates that we try to pass on a healthy environment to our children; he hates that we look after our most vulnerable neighbours; and most of all he hates that we all expect to share in our city's financial success.
- calling on her voters to give Ken Livingstone their second preference in the 2008 London Mayoral election 
- The question is, what do we most want people to think of us: that we are different, or that we can make a difference?
- Advocating the election of a Green Party leader, rather than non-executive Principal Speakers. GP Autumn Conference 2007, Liverpool
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