The world must rethink its approach to the climate crisis by investing trillions of dollars instead of billions in the developing world and moving beyond conventional notions of overseas aid, one of the world's most influential climate economists has urged. "We need to completely rethink the whole nexus between climate, debt and development," Avinash Persaud told the Observer before key summit. "What we see today is new - countries affected by climate disaster, this is happening now. Countries are drowning." (economist Avinash Persaud)

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