Graça Machel, Bono and Tutu urge prime minister to take lead on UN climate change deal and millennium development goals
David Cameron is warned today by Graça Machel, widow of the late South African statesman Nelson Mandela, that unless world leaders made 2015 a year for development, the consequence would not just be poverty but also growing military conflicts from which the rich would be unable to protect themselves for decades to come.
It is Machel's first global political act since the death of her husband last year.
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