Broadly stable atmospheric CO2 and CH4 levels over the past 3 million years - Nature

Broadly stable atmospheric CO2 and CH4 levels over the past 3 million years  NatureIce core reveals low CO2 during warm spell 3 million years ago  New ScientistGlobal ocean heat content over the past 3 million years  NatureSomething Else Used to Drive Climate Changes, Ancient Ice Cores Reveal  ScienceAlertNew ice core studies expand histories of greenhouse gases and ocean temperature to 3 million years  Oregon State University