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'Negative carbon' to benefit poorest nations?

Leaders 'can't afford' failed deal at Copenhagen

Deal on climate finance could push emission cuts

Caritas report calls for new global ethic on climate change

Better warning system could have saved lives in Philippines - experts

Major coastal African cities among most vulnerable to sea level rises

Typhoon-hit Philippines: could more have been done?

Q+A-Haiti's aid controversy

Q+A with U.N. chief for disaster risk reduction

Climate change threatens rare species in Mekong-WWF