Opening with Joni Mitchell’s ‘Big Yellow Taxi’, this week’s RTÉ Brainstorm reminds us of the impact cars have on our cities. Essentially we’ve traded birds, bees and trees for parking lots. Olf Straumeyer, geographer from NUIG and David O’Connor, planner from TUD, joined Ella McSweeney to explore how and why we might make Irish cities car-free.