摘要
During the next three decades, Asia will remain the largest food consumer (increasing from 40 to 55 % of the global consumption between 2000 and 2015) and the largest source of greenhouse gas (GHG) from agriculture (about 50 % of the total emissions). The growth of food demand in Africa and South America will cause substantial increase in GHG emissions by the agri-food sector, unless improved management systems are adopted. The higher food consumption rate (kJ person−1 day−1) around the world is primarily a result of improved crop production and higher percentage of animal products in diet. The latter will, however, result in more CH4 emissions. The growing use of N fertilizers is also a concern. The part not taken up by crops (more than 50 % ) is either lost through leaching or released to the atmosphere as N gases including nitrous oxide. Between 2000 and 2030, the total GHG emissions are expected to increase by about 50 % , with further impact on weather and climate. Mitigation techniques such as improved feed quality for a better digestibility, improved manure management, greater N use efficiency, better water management of rice paddies and/or by increasing the role of agro-forestry in agriculture, have to be considered in order to minimize the impact of agriculture on climate.