To tackle climate change, geoengineer Tim Kruger is developing technology that could remove large quantities of CO2 from the atmosphere. But he says it takes unprecedented cooperation to make it work.

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There are more refugees in the world today than at any other time since World War II. David Miliband says each of us has a moral obligation to help solve this crisis by turning empathy into action.

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Political instability is on the rise. Political scientist Ian Bremmer argues it's because world powers like the U.S. are abandoning their leadership roles, and creating a power vacuum.

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Data analyst Sara Menker believes we could be less than a decade away from a global food crisis. She says Africa can help meet the world's growing demand for food.

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Historian Rutger Bregman says a lack of cash is the cause, not the symptom, of poverty. He proposes a simple but radical solution: give those in need a guaranteed basic income.

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