Atmospheric CO2 is on pace to surpass 550 ppm in the next 30–80 years. Many food crops grown under 550 ppm have protein, iron and zinc contents that are reduced by 3–17% compared with current conditions. We analysed the impact of elevated CO2 concentrations on the sufficiency of dietary intake of iron, zinc and protein for the populations of 151 countries using a model of per-capita food availability stratified by age and sex, assuming constant diets and excluding other climate impacts on food production. We estimate that elevated CO2 could cause an additional 175 million people to be zinc deficient and an additional 122 million people to be protein deficient (assuming 2050 population and CO2 projections). For iron, 1.4 billion women of childbearing age and children under 5 are in countries with greater than 20% anaemia prevalence and would lose >4% of dietary iron. Regions at highest risk—South and Southeast Asia, Africa, and the Middle East—require extra precautions to sustain an already tenuous advance towards improved public health.
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Le Quéré, C., Andrew, R. M. & Canadell, J. G. Global carbon budget 2016.Earth Syst. Sci. Data 8, 605–649 (2016).
Dlugokencky, D. & Tans, P. Globally Averaged Marine Surface Annual Mean Data (NOAA/ESRL, 2017); https://www.esrl.noaa.gov/gmd/ccgg/trends/gl_data.html
Prather, M. et al. in Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) 1395–1445 (IPCC, Cambridge Univ. Press, 2013).
Global Energy and CO 2 Status Report 2017 (International Energy Agency, 2018); http://www.iea.org/publications/freepublications/publication/GECO2017.pdf
Jackson, R. B. et al. Reaching peak emissions. Nat. Clim. Change 6, 7–10 (2016).
Myers, S. S. et al. Climate change and global food systems: potential impacts on food security and undernutrition.Annu. Rev. Public Health 38, 259–277 (2017).
Myers, S. S. et al. Increasing CO2 threatens human nutrition. Nature 510, 139–143 (2014).
Medek, D. E., Schwartz, J. & Myers, S. S.Estimated effects of future atmospheric CO2 concentrations on protein intake and the risk of protein deficiency by country and region.Environ. Health Perspect. 125, 087002 (2017).
Smith, M. R., Micha, R., Golden, C. D., Mozaffarian, D. & Myers, S. S. Global Expanded Nutrient Supply (GENuS) model: a new method for estimating the global dietary supply of nutrients. PLoS ONE 11, e0146976 (2016).
Global Nutrition Report 2015: Actions and Accountability to Advance Nutrition and Sustainable Development (International Food Policy Research Institute, 2015); https://doi.org/10.2499/9780896298835
Myers, S. S., Wessells, K. R., Kloog, I., Zanobetti, A. & Schwartz, J. Effect of increased concentrations of atmospheric carbon dioxide on the global threat of zinc deficiency: a modeling study. Lancet Glob. Health 3, e639–e645 (2015).
Smith, M. R., Golden, C. D. & Myers, S. S.Anthropogenic carbon dioxide emissions may increase the risk of global iron deficiency.GeoHealth 1, 248–257 (2017).
Zimmermann, M. B. & Hurrell, R. F. Nutritional iron deficiency. Lancet 370, 511–520 (2007).
GBD Results Tool (Univ. Washington, 2017); http://ghdx.healthdata.org/gbd-results-tool
Global Consumption Database (World Bank, 2017); http://datatopics.worldbank.org/consumption/
Stevens, G. A. et al. Trends in mild, moderate, and severe stunting and underweight, and progress towards MDG 1 in 141 developing countries: a systematic analysis of population representative data. Lancet 380, 824–834 (2012).
Kassebaum, N. J. et al. A systematic analysis of global anemia burden from 1990 to 2010. Blood 123, 615–624 (2014).
Wessells, K. R. & Brown, K. H. Estimating the global prevalence of zinc deficiency: results based on zinc availability in national food supplies and the prevalence of stunting. PLoS ONE 7, e50568 (2012).
FAOSTAT S uite of Food Security Indicators (Food and Agriculture Organization of the United Nations, 2017); http://www.fao.org/faostat/en/#data/FS
Valin, H. et al. The future of food demand: understanding differences in global economic models. Agr. Econ. 45, 51–67 (2014).
Leakey, A. D. B. et al. Elevated CO2 effects on plant carbon, nitrogen, and water relations: six important lessons from FACE. J. Exp. Biol. 60, 2859–2876 (2009).
Ercoli, L., Schüßler, A., Aduini, I. & Pellegrino, E.Strong increase of durum wheat iron and zinc content by field-inoculation with arbuscular mycorrhizal fungi at different soil nitrogen availabilities.Plant Soil 419, 153–167 (2017).
Huma, N., Rehman, S. U., Anjum, F. M., Murtaza, M. A. & Sheikh, M. A. Food fortification strategy—preventing iron deficiency anemia: a review. Crit. Rev. Food Sci. Nutr. 47, 259–265 (2007).
Smith, M. R. Food composition tables for GENuS. Harvard Dataverse https://doi.org/10.7910/DVN/GNFVTT (2018).
Smith, M. R. Nutrient totals by age and sex (2011). Harvard Dataverse https://doi.org/10.7910/DVN/XIKNDC (2016).
Millward, D. J. & Jackson, A. A. Protein/energy ratios of current diets in developed and developing countries compared with a safe protein/energy ratio: implications for recommended protein and amino acid intakes. Public Health Nutr. 7, 387–405 (2004).
Miller, L. V., Krebs, N. F. & Hambidge, K. M. A mathematical model of zinc absorption in humans as a function of dietary zinc and phytate. J. Nutr. 137, 135–141 (2007).
Hambidge, K. M., Miller, L. V., Westcott, J. E., Sheng, X. & Krebs, N. F. Zinc bioavailability and homeostasis. Am. J. Clin. Nutr. 91, 1478S–1483S (2010).
Wessells, K. R., Singh, G. M. & Brown, K. H. Estimating the global prevalence of inadequate zinc intake from national food balance sheets: effects of methodological assumptions. PLoS ONE 7, e50565 (2012).
Shaheen, N. et al. Food Composition Table for Bangladesh (Univ. Dhaka, Dhaka, 2013).
Prynne, C. J. & Paul, A. A. Food Composition Table for Use in The Gambia (Medical Research Council Human Nutrition Research, Cambridge, 2011).
Longvah, T., Ananthan, R., Bhaskarachary, K. & Venkaiah, K. Indian Food Composition Tables (National Institute of Nutrition, Hyderabad, 2017).
Lukmanji, Z. & Hertzmark, E. Tanzania Food Composition Tables (MUHAS, TFNC & HSPH, 2008).
Schlemmer, U., Frølich, W., Prieto, R. M. & Grases, F. Phytate in foods and significance for humans: food sources, intake, processing, bioavailability, protective role and analysis. Mol. Nutr. Food Res. 53, S330–S375 (2009).
GINI Index (World Bank Estimate) (World Bank Development Research Group, 2014); http://data.worldbank.org/indicator/SI.POV.GINI
Milanovic, B. L. All the Ginis, 1950–2012 (World Bank Development Research Group, 2014); http://www.worldbank.org/en/research/brief/all-the-ginis
International Zinc Nutrition Consultative Group Assessment of the risk of zinc deficiency in populations and options for its control. Food Nutr. Bull. 25, S91–S204 (2004).
World Population Prospects: 2017 (United Nations DESA Population Division, 2017); https://esa.un.org/unpd/wpp/
WHO Global Data Bank on Infant and Young Child Feeding (World Health Organization, 2017); http://www.who.int/nutrition/databases/infantfeeding/en/
Country Reports (World Breastfeeding Trends Initiative, 2017); http://worldbreastfeedingtrends.org/country-report-wbti/
NCD Risk Factor Collaboration A century of trends in adult human height. eLife 5, e13410 (2016).
WHO Multicentre Growth Reference Study Group WHO Child Growth Standards: Methods and Development. Length/Height-for-Age, Weight-for-Age, Weight-for-Length, Weight-for-Height and Body Mass Index-for-Age (World Health Organization, 2006).
This work was supported by Weston Foods US, Inc. (grant no. 207390 to M.R.S.) and by the Wellcome Trust ‘Our Planet, Our Health’ programme (grant no. 106924 to S.S.M.).
The authors declare no competing interests.
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Composite table of the zinc and phytate values used, in units of mg per 100 g of edible portion of each food. Entries from each individual table are given, and the composite values with their original sources are in the far right columns. Full reference information is available in the Methods
Food groupings used to estimate the response of elevated CO2 on nutrient content across broader categories
Percentage declines in nutritional content of each food (with 95% confidence intervals)
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Smith, M.R., Myers, S.S. Impact of anthropogenic CO2 emissions on global human nutrition. Nature Clim Change 8, 834–839 (2018). https://doi.org/10.1038/s41558-018-0253-3
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