The solutions to our problems already exist. Go Big from Ed Miliband tells us how.From affordable housing to tackling the climate crises, for the past four years Ed Miliband has been discovering and interviewing brilliant people all around the world who are tackling problems, transforming communities and pioneering global movements. At this rare moment in history when people everywhere see the need for big change, and the scale of the challenge is daunting, the opportunity for what is possible is far greater.Interviewed by Mark Lawson

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• Raworths Harrogate Literature Festival