The Big Five : TED Radio Hour 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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Life's biggest questions, explored.

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Dian Lofton/Getty/iStock

The TED Radio Hour: The Big Five

Dian Lofton/Getty/iStock

The Big Five

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.

David Miliband on the TED stage. Bret Hartman/TED hide caption

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Bret Hartman/TED

David Miliband: Whose Responsibility Is It To Solve The Global Refugee Crisis?

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Ian Bremmer on the TED stage. Dian Lofton/TED hide caption

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Ian Bremmer: What Happens When The World's Superpower No Longer Wants To Lead?

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Rutger Bregman on the TED stage. Bret Hartman/TED hide caption

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Rutger Bregman: Is A Universal Basic Income The Answer To Ending Poverty?

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TED Radio HourTED Radio Hour

Life's biggest questions, explored.