Methane emissions at end of Paleocene

Based on oxygen isotope ratios from fossilized mammalian tooth enamel, a study finds that during the Paleocene-Eocene transition, massive methane emissions—but not carbon dioxide emissions—may have driven the low atmospheric carbon isotope ratio and rapid temperature rise that mark this greenhouse warming event, findings that may provide insights into future climate change. - Read at PNAS.org

Article #15-18116: “Temperature and atmospheric CO2 concentration estimates through the PETM using triple oxygen isotope analysis of mammalian bioapatite,” by Alexander Gehler, Philip D. Gingerich, and Andreas Pack.