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Going negative: exploring new ways to remove atmospheric CO2

Mark Shwartz
February 20, 2013
Amanda Bidwell, USDA/Agricultural Research Service
Decaying plants contribute to global warming by releasing carbon dioxide into the air. Now researchers are converting plant wastes into biochar – a charcoal-like substance that can be used as fertilizer to permanently lock the carbon underground. These lettuce plots in Minnesota were amended with 20,000 pounds of macadamia-nutshell biochar per acre to evaluate the effect on crop yield, soil fertility and greenhouse gas production from the field.C