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Rising atmospheric carbon dioxide (CO2) reduces essential nutrients like zinc in crops. This global elemental shift threatens nutritional security, making food more caloric but less healthy, even if food availability is maintained.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Biochemistry

Background:

  • Rising atmospheric carbon dioxide (CO2) is known to affect food availability through climate and socioeconomic changes.
  • The direct impact of CO2 on plant nutrient composition (stoichiometry) and subsequent human nutrition is less understood.
  • Plant stoichiometry, the balance of elements within plants, can be altered by environmental factors like CO2.

Purpose of the Study:

  • To investigate the direct effects of elevated CO2 on the elemental composition of edible plants.
  • To quantify changes in plant stoichiometry across various species and nutrient types.
  • To assess the implications of these changes for human nutrition and food security.

Main Methods:

  • Conducted the largest meta-analysis to date on edible plant parts, analyzing 5324 entries and 29,524 observation pairs.
  • Included data from 43 different crops and analyzed 32 essential and anti-nutrients.
  • Utilized a new methodology to quantify elemental shifts in plants under elevated CO2.

Main Results:

  • Demonstrated a widespread elemental shift in edible plants due to rising CO2 levels across diverse species.
  • Observed differential responses in nutrient elements, with zinc showing the most significant decrease.
  • Found that both C3 and C4 plants are affected, with impacts varying by species and tissue type.

Conclusions:

  • Elevated CO2 significantly alters the nutritional quality of crops, reducing essential mineral content.
  • This stoichiometric shift poses a threat to nutrient security, potentially worsening malnutrition globally.
  • Future food supplies may be calorically sufficient but nutritionally deficient, impacting public health.