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Greenhouse experiments on peanut plants found that rising temperatures (daytime high and nighttime low) decreased peanut seed set—the percent of flowers on a plant that make seeds, regardless of the level of carbon dioxide in the atmosphere. When daytime highs reached 104°F, only half a plant’s flowers made seed. At 111°F, seed set dropped to zero. Graph by climate.gov team, based on data from P.V. Vara Prasad, Kansas State University.