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Climate change is already impacting major crops worldwide. Increased temperatures are responsible for reducing yields of coffee, corn, rice, soybeans and wheat. As Politico reports, there are also lesser-known effects taking root in our food supply. A mathematician has found that climate change is responsible for effectively turning plants into junk food.

Irakli Loladze identified that rising levels of carbon dioxide (CO2) in our atmosphere are responsible for declining nutrition in plants, Politico reports. As CO2 has increased, the balance of sugar to nutrients such as iron, protein and zinc has been disrupted.

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“Every leaf and every grass blade on earth makes more and more sugars as CO2 levels keep rising,” Loladze told Politico. “We are witnessing the greatest injection of carbohydrates into the biosphere in human history― [an] injection that dilutes other nutrients in our food supply.”