<em>Chlorobium phaeoferrooxidans</em> (IMAGE) University of Alberta Caption Ancient microbes, such as the Chlorobium phaeoferrooxidans pictured here, played an important role in the development of Archean banded iron formations and the warming of Earth's early climate. Credit to Katharine Thompson. Credit Katharine Thompson Usage Restrictions with credit to Katharine Thompson. License Licensed 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.