Obama's $3 billion boost for Africa President Barack Obama will announce private sector pledges worth $3 billion (£1.9 billion) aimed at alleviating hunger in Africa On Saturday, Obama and the other G-8 leaders will be joined at Camp David by the heads of four African countries - Ghana, Ethiopia, Tanzania and Benin - for a session on food security Photo by: AFP The US president will also urge the world's biggest economies to make good on their own financial promises. Mr Obama is due to unveil the food security initiative in a speech today in Washington that begins four days of international summitry. World leaders are gathering at Camp David, the presidential retreat in the Maryland mountains, later in the day for a summit of the Group of Eight leading industrial nations. Obama heads to Chicago on Saturday evening for NATO...