Caroline is co-leader of the Green Party of England and Wales, a position she shares with Jonathan Bartley. She was elected as the Green’s first Member of Parliament for Brighton Pavilion in 2010 and served as leader of the Green Party from 2008 to 2012. She was one of the Party's first MEPs (from 1999-2010) and represented the South East region until becoming the UK's first Green MP. Caroline sits on Parliament’s Environmental Audit Committee and chairs cross party groups, on fuel poverty and energy efficiency, CND, climate change and limits to growth. She is also a member of various other all-party groups, including on HIV and Aids, 6th form colleges, housing, children and international corporate responsibility. She is the author of Honourable Friends, a book detailing her first parliamentary term.