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Ratings agency Fitch lowered the outlook for its credit rating for British government debt to negative from stable on Wednesday.
The University of Pretoria professor recently accepted a nomination as member of the Standing Committee for Freedom and Responsibility in Science within the International Science Council (ISC).
Activists sharply criticised a pledge by the Group of Seven rich countries on Tuesday to commit $4. 5 billion to fight global hunger, saying the sum fell short of what was needed, with millions of people on the brink of starvation.