Rice is a staple food that forms an important part of the diet for a large part of the world’s human population. It is the second-most consumed cereal grain in topical Latin America and East, South and Southeast Asia (FAO 2006). Rice constitutes the major economic activity and a key source of employment and income for the rural population in these regions. In 2006, over 154 million ha of land globally was cultivated with rice, 0-98 in developing countries and only 0-02 in developed countries (FAO 2006). Rice production, especially from developing countries, accounted for 0-11 of all agricultural anthropogenic GHG emission (Smith et al, 2007).