What are the five biggest global challenges we face right now -- and what can we do about them? This hour, TED speakers explore some radical solutions to these enduring problems

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Tags:  TED radio hour,  global issues,  carbon emission,  refugees,  political instability,  food crisis,  poverty plan,  Tim Kruger,  Sara Menker,  Rutger Bregman,  Ian Bremmer,  David Miliband