Noonan is a councillor on Kilkenny County Council. He is the Green Party spokesperson on local government, regional development and rural affairs. He has been a councillor since 2004. He served as Mayor of Kilkenny in 2009. Noonan was formerly a community and environmental activist. He contested the leadership of the Green Party in 2011, the by-election in 2015 and the 2016 general election.

We [the Green Party] believe that the climate crisis needs strong political leaders to legislate towards a zero carbon economy.

I want to see young people in Carlow and Kilkenny able to stay and find employment here.

I would see the Joint Oireachtas Committee report on climate brought forward by all parties with see cross-party action on climate change, regardless of who is in government.