Forty years ago, the world's leaders met to discuss our perilous dependency on a stressed global environment. In Stockholm then, as in Rio now, innovation was key. But at Rio+20, negotiators need to look a lot harder at the nature, depth and scope of inclusion in innovation if they are to map out a more equitable, socially just and sustainable future.

Guardian development readers need no reminding of the scale and urgency of global challenges such as the economic crisis, our self-destructive drift to climate crisis, or the scandal of 1 billion people going to bed hungry every night. We're all painfully aware that our collective responses are fragmented and inadequate, undermined by differences of view and our apparent inability to act on the profound links between these issues.