Mahatma Gandhi once said “You must be the change you wish to see in the world.” That sense of inspiration underpins “Art for a Changing Earth”, the exhibition which opens the second season of GSK contemporary at the Royal Academy in London this month. Thirty artists including Keith Tyson, Darren Almond, Sophie Calle, Tacita Dean, Lucy and Jorge Orta and novelist Ian McEwan have created work that juggles the balance between environmental hope and reality.