Poor nations say they are far more vulnerable than the rich to powerful hurricanes, heat waves, droughts and rising sea levels and want clear promises that aid will rise from an existing goal of US$100 billion a year by 2020.

For many developing nations “climate change poses an existential risk, it’s a matter of life and death,” Nozipho Mxakato-Diseko, South Africa’s delegate who speaks for more than 130 developing nations, said at U.N. climate negotiations.

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