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Going negative: exploring new ways to remove atmospheric CO2

February 20, 2013
By
Mark Shwartz
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