大气中二氧化碳含量的增加会降低稻米的营养价值，据一个国际研究小组从田间试验中分析大米样品。在大米消费量最高和国内生产总值最低的国家，由于大米等低成本主食的营养价值下降，可能会出现更多的营养不良。

Rice becomes less nutritious as CO2 levels rise

https://www.sciencedaily.com/releases/2018/05/180523172256.htm

1. Chunwu Zhu, Kazuhiko Kobayashi, Irakli Loladze, Jianguo Zhu, Qian Jiang, Xi Xu, Gang Liu, Saman Seneweera, Kristie L. Ebi, Adam Drewnowski, Naomi K. Fukagawa, Lewis H. Ziska. Carbon dioxide (CO 2 ) levels this century will alter the protein, micronutrients, and vitamin content of rice grains with potential health consequences for the poorest rice-dependent countries. Science Advances, 2018; 4 (5): eaaq1012 DOI: 10.1126/sciadv.aaq1012