Independent: The world’s most powerful finance ministers and central bankers are meeting in Washington tomorrow; but as they preoccupy themselves with the global credit crunch, another crisis, far more grave, is facing the world’s poorest people. A dramatic rise in the worldwide cost of food is provoking riots throughout the Third World where millions more of the world’s most vulnerable people are facing starvation as food shortages grow and cereal prices soar. It threatens to become the biggest …