On 20 November 2014 we celebrated our 35th anniversary with over 400 senior figures from politics, civil society and business, with speeches from special guests Ed Miliband MP and Oliver Letwin MP.
See the Storify
We also launched Green Alliance's 2015-18 strategy and announced our new chair, Dame Fiona Reynolds.
We asked 35 people to tell us what they have valued most about working with us, including politicians, business partners, the third sector and ex directors of Green Alliance.
See what they said