Hot and Cold (image) The Earth Institute at Columbia University Share Print E-Mail Caption A new study using sea floor sediment from the North Atlantic connects a series of abrupt climate changes during the last ice age with changes in the ocean overturning circulation. Credit Margie Turrin/Lamont-Doherty Earth Observatory Usage Restrictions Credit must be given. Share Print E-Mail 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.