In some African countries, for example, yields could decline by as much as 50% by 2020. Climate change would also lead to increased water stress, which by 2020 could affect 75-250 million people in Africa alone.
气候变化的其他负面影响还包括农作物产量可能减少。例如，在某些非洲国家，到2020年，农作物产量可能减少50%。气候变化还会引起用水短缺加剧，到2020年仅在非洲就有750万到2500万人受到影响。