There appears a global consensus over the impact of global warming.Wheat yields are down, water is becoming scarcer and the frequency and severity of floods and droughts are increasing.

• 全球气候变暖对我们造成的不良影响已经是有目共睹了：小麦生产量降低，水资源越来越缺乏，洪涝灾害和干旱发生的频率和危害度增大。