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American Focus > Blog > Tech and Science > Sprinkling limestone on farms may offer an unexpected climate win
Tech and Science

Sprinkling limestone on farms may offer an unexpected climate win

Last updated: July 21, 2025 5:50 pm
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Sprinkling limestone on farms may offer an unexpected climate win
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Farmers spread lime on pastures to improve the quality of the soil

Wayne HUTCHINSON/Alamy

The Surprising Carbon-Capturing Potential of Farming Practices

The age-old tradition of applying crushed limestone to agricultural land to enhance crop productivity has long been associated with greenhouse gas emissions. However, recent research indicates that this practice, known as liming, may play a significant role in sequestering carbon dioxide from the atmosphere.

Dr. Noah Planavsky from Yale University suggests that liming can act as a carbon sink rather than a carbon source. This revelation could revolutionize farming practices worldwide, although the effectiveness of liming as a carbon sink varies across different regions.

Traditionally, the carbon released during the dissolution of limestone in acidic soil is considered a source of emissions. Yet, Dr. Tim Jesper Suhrhoff argues that the current accounting overlooks the fact that soil acidity levels are primarily caused by other factors like fertilizer use and fossil fuel emissions. In the absence of lime, the soil’s natural alkaline minerals dissolve and release carbon dioxide, leading to emissions regardless of liming.

To provide a more comprehensive assessment of the carbon impact of liming, researchers conducted a study in the Mississippi river basin, a major agricultural region in the US. By analyzing the net carbon effect of liming activities from 1900 to 2015, they discovered that liming actually removed 300 to 400 million tonnes of CO2, contrary to the previous assumption of emissions.

Furthermore, combining liming with the practice of spreading crushed volcanic rocks on farmland, known as enhanced rock weathering, could enhance carbon sequestration efforts. Dr. Planavsky highlights the potential for these dual practices to significantly reduce atmospheric CO2 levels.

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While acknowledging the carbon sequestration benefits of liming, Dr. Wolfram Buss from the Australian National University cautions that the efficacy of this practice may vary depending on soil conditions. He emphasizes the need to identify regions where liming can maximize carbon removal without adverse effects.

Incentivizing farmers to adopt carbon-sequestering practices like liming could not only boost crop yields but also contribute to substantial carbon dioxide removal on a global scale. This initiative could be especially beneficial for small-scale farmers with limited resources.

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TAGGED:ClimatefarmsLimestoneofferSprinklingunexpectedwin
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