A new study combining experimental data with decades of observation reveals that increasing carbon dioxide (CO2) levels are leading to increased biomass production in C4 grasses, particularly in water-limited environments. The research, published in *Nature* on August 19, 2026, analyzed CO2 enrichment experiments alongside 30 years of data from southern African savannas.
The study demonstrates a clear link between rising CO2 concentrations and enhanced growth in C4 grasses. Researchers combined a meta-analysis of CO2 enrichment experiments with three decades of observations from southern African savannas to reach this conclusion. The findings indicate that these grasses are responding positively to the increased CO2, showing greater biomass production.
The research specifically focuses on C4 grasses and their response to elevated CO2 in environments where water availability is a limiting factor. This is significant because C4 grasses are a dominant plant type in many tropical and subtropical grasslands and savannas, playing a crucial role in these ecosystems. The study’s findings, detailed in the article with doi:10.1038/s41586-026-10935-4, provide evidence of a fertilization effect from increased CO2 on these important plant species.
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