Peter Duncan: actor, panto filmmaker, Blue Peter man and the UK’s former Chief Scout talks about his world travels observing the changing planet. In his new role as Ambassador for Se-ed (Sustainability and Environmental Education). He asks the question ‘if a tree falls down in the forest and there’s no one to hear it, does it make a sound’. For eco-warriors of all ages.Edinburgh Fringe Festival. The Stables at Prestonfield – The Stables. Venue 105