Rising CO2 is draining nutrients from staple foods, threatening global health

Rising atmospheric CO2 concentrations are diluting nutrient density in common crops, lowering minerals like zinc and iron in staples such as chickpeas, rice, and wheat. A Leiden University meta-analysis finds nutrient declines since the 1980s with projections showing billions could face hidden hunger and anemia by 2040, especially in low-income regions. The so-called dilution effect occurs as plants accumulate more sugars under higher CO2 but uptake of minerals lags, a problem compounded by soil and temperature changes. Fortification alone isn’t a cure; experts urge diverse diets, nutritious crop varieties, and aggressive emission reductions to protect global health.