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AUDIO SLIDESHOW: East Africa battles worst drought in decades

Tajikistan faces uncertain future with growing food shortages

Humanitarian crisis looms around shrinking Lake Chad -- U.N.

Drought warnings in Nigeria expose food security concerns in West Africa

'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

Next time disaster strikes the Philippines, tweet for help

The next steps in Samoa