Welcome—the Paleoceanography and Paleoclimatology (Paleo²) Lab at the Department of Geosciences at the University of Arizona studies climate variability across Earth’s history and future. We are interested in the causes and mechanisms of oceanic and atmospheric variations and how such information can help anticipate future impacts of global change. To do so, we use a combination of climate observations, (bio)geochemical measurements of carbonate rocks and fossils, and climate model simulations. We are motivated to use the geological record as a laboratory to fully understand the machinery of Earth’s climate system and explore its response to perturbations.