By Emma Farge GENEVA (Reuters) -A United Nations agency warned on Monday of the risk of a monetary policy-induced global recession that would have especially serious consequences for developing countries and called for a new strategy. “Excessive monetary tightening could usher in a period of stagnation and economic instability” for some countries, the United Nations Conference on Trade and Development (UNCTAD) said in a statement released alongside its annual report. “Any belief that they (central banks) will be able to bring down prices by relying on higher interest rates without generating a…