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We are interested in tephra (volcanic ash) as a potential solution for climate change. Why tephra? Volcanic ash may help to remove CO2 from the atmosphere. We want to see if growing plants in different soils with tephra can increase the rate at which CO2 is transferred from the atmosphere to the soil. The aim of this experiment is to find out if tephra can help to remove CO2 from the atmosphere in the presence of plants and store it in the soil and water that passes through the soil. In other words, could plants speed up CO2 uptake from the atmosphere with help of volcanic ash?