Elevated levels of CO2 can stimulate photosynthesis in plants and increase their uptake of atmospheric carbon. A five-year study in Minnesota grasslands shows that increased plant uptake of CO2 is restricted by the availability of vital nutrients and water.
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Silver, W. A faulty fertilizer. Nature Geosci 7, 857–858 (2014). https://doi.org/10.1038/ngeo2292