Rising CO2 Weakens Nutrients in Staple Foods

Researchers compared crops grown under different carbon dioxide levels and found that rising CO2 diminishes essential nutrients like iron and zinc. The study, spanning data from 43 crops, reveals a roughly 4.4% average decline in key nutrients over a single generation. Plants grow faster with increased carbon dioxide, but this growth dilutes the concentration of vital vitamins and minerals.

This weakening of nutritional content disproportionately affects Black Americans, who already experience higher rates of nutrient deficiencies and health disparities. Ashley Webb, an urban farmer in New Orleans, offers gardening classes to help residents understand their food systems and grow nutrient-rich produce. The research shows some nutrients decreased by as much as 38%, alongside an increase in calorie counts.

Scientists also note that harmful substances like lead may be increasing in crops, particularly on land near pollution sources. While federal farm policy recently cut funding for conservation programs, some farmers are reclaiming traditional practices to build more resilient food systems. The work to understand and counteract these effects continues as carbon dioxide levels rise.