Reconstruction of Nitrogen Fixation (IMAGE) Princeton University Caption The reconstructed history of North Atlantic nitrogen fixation (black) is partly driven by the cyclic wobble of the Earth's axis of rotation (orange) and its effect on equatorial Atlantic upwelling. Credit Image courtesy of Daniel Sigman, Department of Geosciences Usage Restrictions None 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.