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Ethnic violence and hunger add to south Sudan's woes

Researchers urge rules to stop 'land-grabbing' worsening hunger

Obama's first 100 days: Key humanitarian issues

Food prices still rising in many poor countries - UN

Climate change, wars could sink aid system - Oxfam

2008 was deadliest year for aid workers - study

Are G20 commitments for poor countries enough?

Sudan: Useful links

VIDEOS: Sudan turmoil

Aid groups in Chad brace for refugees from Darfur