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Researchers say we can't count on plants forever for CO2 storage Rising carbon dioxide levels in the atmosphere will over time lead to nutrient limitations to grassland productivity, according to a study by researchers at the University of Michigan and the University of Minnesota. An article to be published Thursday in the journal Nature, which is based on a six-year study—the longest known study of its kind—says that decision-makers need to understand the relationship between fossil fuel emissions and plant productivity and nutrients when they set policy. Grasslands amount to about 30 percent of the arable land surface of the world.
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