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Jonathon Porritt in conversation with Andy Fryers

The World Wildlife Fund at 50

Hay Festival 2011 , 
The WWF ambassador examines the evolution of conservation. What have we learnt, and how do we address the challenges facing us for a sustainable future where people and nature thrive?
 
Read more by and about Jonathon Porritt www.guardian.co.uk/profile/jonathonporritt