El Nino risks disrupting harvests worldwide by reducing rainfall in Australia and altering patterns across South America as well as baking parts of Asia. Central Thailand is the driest in more than 20 years and India's monsoon is heading for the first back-to-back shortfall in three decades. The inflation- boosting effect of the first El Nino since 2010 also poses a risk to the global economy, Citigroup Inc says.