Guardian: The world will contain 4 billion people living in abject poverty by 2050 unless the poorest countries adopt policies to deliver rapid and sustained growth over the coming decades, a report backed by the World Bank and the British government said yesterday. After a two-year investigation, a group of policymakers and economists published a blueprint designed to allow the least developed nations to emulate the 13 countries that have expanded at an average rate of at least 7% a year for …