Upcycling carbon dioxide (IMAGE) Northwestern University Caption Synthetic biologists have engineered bacteria to convert carbon waste into valuable chemicals. The carbon-negative approach could contribute to a net-zero emissions economy. Credit Justin Muir Usage Restrictions Add credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.