What's behind the UN's latest climate report?

In a UN report, the world's leading climate scientists have issued a stark warning: the world must act now to secure a liveable future. But has the UN been successful in helping to mitigate the looming climate catastrophe? Join host Nick Clark. Guests:  Saleemul Huq - Director of International Centre for Climate Change and Development. Doug Parr - Greenpeace chief scientist in Oxford. Maruice Onyango - Regional Head of Disaster Risk Management, Plan International.