' Organic ' may reduce greenhouse gases , provide clean energy , improve farming . Organic waste can be turned into valuable , renewable resources . Ancient farming method could improve crop yields . Experts : Biochar could reduce harmful global CO2 emissions .
'Biochar ' may reduce greenhouse gases , produce clean energy , help farming . Organic waste can be turned into valuable , renewable resources . Ancient farming method could improve crop yields . Experts : Biochar could reduce harmful global CO2 levels .