Food crops lose nutrients as carbon dioxide pollution rises
Updated
Updated · The Washington Post · Apr 30
Food crops lose nutrients as carbon dioxide pollution rises
8 articles · Updated · The Washington Post · Apr 30
A survey of 43 crops found average nutrient density has fallen 3.2% since the late 1980s, with chickpea zinc projected to drop nearly 40% by 2040.
Researchers warn hidden hunger could worsen for 2 billion people already lacking nutrients, while by 2050 another 175 million may face zinc deficiency and 122 million protein deficiency.
Experts say poorer countries reliant on staples such as wheat and rice face the greatest risks, including anemia in women and children, and argue cutting emissions and diversifying diets are the best protections.
With staple crops losing nutrients due to rising CO2, could biofortification and new farming methods truly protect the world's most vulnerable populations?
If food fortification programs are so effective, why do billions still face nutrient gaps—and what scalable solutions are missing from current strategies?
Quantifying the 8-31% Nutrient Decline in Global Food Crops Driven by Elevated Atmospheric CO2
Overview
Rising atmospheric CO2 levels since the industrial revolution have caused a significant decline in the nutrient density of essential food crops. Elevated CO2 boosts plant growth and carbohydrate production but reduces the uptake and concentration of vital minerals and proteins, leading to widespread nutrient dilution. This has resulted in decreases of key nutrients like protein, zinc, and iron, worsening global micronutrient deficiencies and intensifying hidden hunger, especially in low-income regions reliant on staple crops. Projections to 2050 indicate these declines will deepen, threatening the health of billions and increasing economic and social risks worldwide. Addressing this crisis requires urgent climate action and integrated agricultural and nutrition strategies.