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“Even the infrequent heavy rains we get in the West might be enough to drive enhanced rock weathering and remove carbon dioxide.”
Crushed volcanic rock used on crop fields may be effective and even essential in reducing carbon from the atmosphere and potentially thwarting global warming. Researchers from Cornell University and the University of California, Davis undertook field studies in dry lands andThe way the system works is that as rain drops it picks up carbon dioxide from the atmosphere and combines with volcanic rock to lock it up.
The researchers, therefore, decided to undertake a few tests in dry regions. On five acres of a fallowed cornfield in the Sacramento Valley, researchers spread crushed rock, including both metabasalt and olivine. Metabasalt is a type of metamorphic rock that often results from the solidification of molten lava on the earth's surface while olivine is a silicate mineral found in certain types of igneous rocks.
“These reactions require water,” said lead author Iris Holzer, a doctoral candidate in soils and biogeochemistry in the Department of Land, Air and Water Resources at UC Davis.The scientist said his team needed to know if the process could function in drier regions and if their various measuring techniques were reliable for evaluating the potential of the technique to store carbon globally.
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